Question

A ball of mass 1 kg is dropped from 20 m height on ground and it rebounds to height 5 M find magnitude of change in momentum during its collision with the ground. (take g =1
0m/s^2)

please solve the question in details

Answer 1

for downward motion ;

u=0 m/s

a=10 m/s2

s=20 m

using v2- u2=2as

v= 20m/s



for upward motion;

v=0 m/s

a=10 m/s2

s=5 m using v2 – u2=2as

u= -10 m/s

I=mv – mu

I=20+10=30 kg m/s