Question

4.
A ball of mass 0.1 kg strikes a wall normally with
a speed of 30 m/s and rebounds with a speed of 20
m/s. The magnitude of change in momentum of the
ball is
(a) 1 kg m/s (b) 2 kg m/s
(C) 3 kg m/s (d) 5 kg m/s
totine1 force of attraction heter
tin
ato​

Answer 1

Given ,u=30m/s ,v=20m/s  

m=0.1kg

impulse − change in momentum of the body,

=mv−mu=m(v−u)

=0.1(−20−30)=−10N

Hence,