Question

A force of 200N acts in the opposite direction on a body moving with uniform velocity and brings it to rest in 0.25sec. What is the initial momentum of the body

Answer 1

Given :

Force = 200N

Time = 0.25 sec

To find :

The initial momentum of the body

Solution :

• F = dp/dt

• F = m(v-u) / dt

• F = -mu / t

• Ft = mu

• Initial momentum = 200 × 0.25

                            = 50 kg-m/s

The initial momentum of the body is 50 kg-m/s