Question
A 50 kg gymnast falls freely from a height of 4 m on to a trampoline. The trampoline then bounces her back upward with a speed equal to the speed at which she first struck the trampoline. What is the average force the trampoline applies on the gymnast ?
A) 50 N B) 200 N C) 500 N D) 2000 N E) more information is required
Joshi sir comment
Calculate rate of change of momentum