Question

A ball of mass m falls freely from rest. When it has

reached a speed v, it strikes a vertical spring. The

spring is compressed by distance y before the ball

moves upwards again. Assume that all the energy

the ball loses becomes elastic potential energy in

the spring. What is the average force exerted by the

spring during its compression?

Answer 1

(1/2*mass*velocity^2)/no. of times iet recoiled
is the average force