Question

a 2kg ball moving at speed 5m/s hits a wall .the force exerted by the wall on the ball is 100n .if the collision is perfectly elastic , calculate the contact time between the ball and the wall​

Answer 1

0.2s

force = change in momentum/ time

time = change in momentum/time

Step-by-step explanation:

first, let's find the change in momentum

pf-pi

5×(-2) - 5× 2

-20kgm/s = 20kgm/s(by changing the direction of whole system)

time = change in momentum/time

20/100

0.2s