Calculating Relative Speed

Oct 13, 2025 by wbrum.org 149 views

Introduction

In this article, we will explore a classic problem involving circular motion and relative motion. Two individuals, Siddharth and Kunal, start moving in a circular path in the same direction with different speeds. We need to determine the time it takes for them to meet a second time if they start simultaneously.

Understanding the Problem

Let's break down the problem and understand the key components:

Siddharth and Kunal are moving in a circular path with a radius of 7 km.
Siddharth is moving at a speed of 22 km/hr, while Kunal is moving at a speed of 44 km/hr.
Both individuals start moving simultaneously.

Relative Motion

To solve this problem, we need to consider the relative motion between Siddharth and Kunal. Since they are moving in the same direction, we can calculate the relative speed between them.

Calculating Relative Speed

The relative speed between Siddharth and Kunal is the difference between their speeds:

Relative speed = Kunal's speed - Siddharth's speed Relative speed = 44 km/hr - 22 km/hr Relative speed = 22 km/hr

Time to Meet for the First Time

To find the time it takes for Siddharth and Kunal to meet for the first time, we can use the concept of relative motion. Since they are moving in a circular path, we can consider the distance covered by each individual as they meet for the first time.

Calculating Distance Covered

The distance covered by each individual as they meet for the first time is equal to the circumference of the circular path:

Distance = 2 × π × radius Distance = 2 × 3.14 × 7 km Distance = 44 km

Calculating Time to Meet for the First Time

Now that we have the distance covered by each individual, we can calculate the time it takes for them to meet for the first time:

Time = Distance / Relative speed Time = 44 km / 22 km/hr Time = 2 hours

Time to Meet for the Second Time

Since Siddharth and Kunal meet for the first time after 2 hours, we need to find the time it takes for them to meet for the second time. To do this, we can use the concept of circular motion and the fact that they are moving in the same direction.

Calculating Time to Meet for the Second Time

Since they meet for the first time after 2 hours, they will meet for the second time after another 2 hours. Therefore, the time it takes for Siddharth and Kunal to meet for the second time is:

Time = 2 hours + 2 hours Time = 4 hours

Conclusion

In this article, we explored a classic problem involving circular motion and relative motion. We calculated the time it takes for Siddharth and Kunal to meet for the first time and the second time. By understanding the key components of the problem and using the concept of relative motion, we were able to arrive at the correct solution.

Key Takeaways

The relative speed between Siddharth and Kunal is 22 km/hr.
The distance covered by each individual as they meet for the first time is 44 km.
The time it takes for Siddharth and Kunal to meet for the first time is 2 hours.
The time it takes for Siddharth and Kunal to meet for the second time is 4 hours.

Final Answer

Q&A: Frequently Asked Questions

Q: What is the relative speed between Siddharth and Kunal?

A: The relative speed between Siddharth and Kunal is 22 km/hr, which is the difference between their speeds.

Q: How do we calculate the distance covered by each individual as they meet for the first time?

A: We can calculate the distance covered by each individual as they meet for the first time by using the formula: Distance = 2 × π × radius. In this case, the distance covered is 44 km.

Q: What is the time it takes for Siddharth and Kunal to meet for the first time?

A: The time it takes for Siddharth and Kunal to meet for the first time is 2 hours, which is calculated by dividing the distance covered by the relative speed.

Q: How do we calculate the time it takes for Siddharth and Kunal to meet for the second time?

A: Since Siddharth and Kunal meet for the first time after 2 hours, we can calculate the time it takes for them to meet for the second time by adding another 2 hours to the initial time.

Q: What is the final answer to the problem?

A: The final answer is 4 hours, which is the time it takes for Siddharth and Kunal to meet for the second time.

Q: What are the key takeaways from this problem?

A: The key takeaways from this problem are:

The relative speed between Siddharth and Kunal is 22 km/hr.
The distance covered by each individual as they meet for the first time is 44 km.
The time it takes for Siddharth and Kunal to meet for the first time is 2 hours.
The time it takes for Siddharth and Kunal to meet for the second time is 4 hours.

Q: What is the importance of understanding relative motion in this problem?

A: Understanding relative motion is crucial in solving this problem, as it allows us to calculate the time it takes for Siddharth and Kunal to meet for the first and second times.

Q: Can we apply the concept of circular motion to other real-world problems?

A: Yes, the concept of circular motion can be applied to other real-world problems, such as calculating the time it takes for two objects to meet in a circular path.

Q: What are some common applications of circular motion in real life?

A: Some common applications of circular motion in real life include:

Calculating the time it takes for two objects to meet in a circular path.
Determining the distance covered by an object in a circular path.
Understanding the concept of relative motion in circular motion.

Conclusion

In this article, we have explored a classic problem involving circular motion and relative motion. We have answered frequently asked questions and provided key takeaways from the problem. By understanding the concept of relative motion and circular motion, we can apply these concepts to other real-world problems.