Question

A person from a truck, moving with a constant speed of $60\, km/h^{-1}$, throws a ball upwards with a speed of $60\, km/h^{-1}$. Neglecting the effect of rotation of Earth choose the correct answer from the given choice

• A. The person cannot catch the ball when it comes down since the truck is moving
• B. The person can catch the ball when it comes down, if the truck is stopped immediately after throwing the ball
• C. The person can catch the ball when it comes down, if the truck moves with speed less than 60 km/h but does not stop
• D. The person can catch the ball when it comes down, if the truck moves with speed more than 60km/h
• E. The person can catch the ball when it comes down, if the truck continues to move with a constant speed of 60 km/h

Answer 1

Answer: (E)

When the person throws a ball in upward direction from moving truck, ball also acquire a speed of $60 \,km / h$ in horizontal direction. So, if truck continues to move with same speed, ball comes down again in hands of person.