Question

Give one example of a situation in which a body has a certain average speed but its average velocity is zero.

Answer 1

When you throw ball in upward direction, it comes back to your hands. During the entire motion, the net displacement is zero (Final and initial positions are same), which means the average velocity is zero because it depends on the displacement, but the distance covered is non-zero. Hence, the average speed is non-zero because average speed depends on the total distance covered by the ball which is equal to the length of the entire path.