Question

Q3. A body of mass 20 kg moves with an
acceleration of 2ms 2. The rate of change
of momentum in S.I. unit is -
a) 40
b) 10
c) 4
d) 1
Q4. A body of mass M strikes against wall with
a velocity v and rebounds with the same
velocity. Its change in momentum is -
a) zero
b) Mv
c) -Mv
d) -2 Mv​

Answer 1

Answer:

Q4.Mv

Explanation:

As mass is constant and velocity is v.

Q3. I need to calculate

Answer 2

Answer:

1) change in momentum = 20 × 2

= 40 kg.m/s

2) change in momentum = mv - mv

= zero