Question

A force of 10 N acts on a body of mass 2 kg for 3 s, initially at rest, find(i) the velocity acquired by the body (ii) change in momentum of the body.​

Answer 1

Answer:

Force = mass× acceleration

F =10 N

mass = 2 kg

a = F/m = 10/2 = 5 m/s²

i)now, u = 0

t = 3 sec

v = u + at = 0 + 3×5 = 15 m/s

ii) initial momentum = mu = 2×0 =0

final momentum = mv = 2×15 = 30 kg m/s

change in momentum = final momentum - initial momentum 

                                   = 30 -0 = 30 kg m/s

Answer 2

Answer:

(i) The velocity of the body is 15 m/s.

(ii) Change in momentum is 30 N.

Explanation:

Referred to the attachment.