Question

The velocity of a body of mass 20kg increases from 4m/s to 8m/s when a force acts on it

for 2s.


a)What is the momentum before the force acts?


b)What is the momentum after the force acts?


c)What is the value of force?

sure brainlilist ​

Answer 1

Answer:

Mass of the body =10 kg

Initial velocity u=4 m/s

Final velocity v=8 m/s

Time t=2s

a) Momentum before force acts p

1

=m×u=10×4=40kg.m/s

b) Momentum after force acts p

2

=m×v=10×8=80kg.m/s

c) Gain in momentum per second =

2

40

=20kg.m/s

d) Acceleration a=

t

v−u

=

2

8−4

=2m/s

2

Force =m×a=10×2=20 N

Answer 2

Answer:

hope is it not help you

sorry for it