Question

A force of 10N starts acting on a body kept at rest. find the momentum of the at 5s after the force starts acting

Answer 1

heya..


Let 'm' be the mass of the body. The acceleration be 'a'.

F = ma

=> 10 = ma

=> a = 10/m

Velocity after 1 s is, v1 = at = 10/m Ns

Momentum after 1 s is, p1 = mv1 = m(10/m) = 10 Ns


Velocity after 5 s is, v5 = at = (10/m)X5 = 50/m Ns

hope helped..

Answer 2

Let 'm' be the mass of the body. The acceleration be 'a'.

F = ma

=> 10 = ma

=> a = 10/m

Velocity after 1 s is, v1 = at = 10/m Ns

Momentum after 1 s is, p1 = mv1 = m(10/m) = 10 Ns

Velocity after 5 s is, v5 = at = (10/m)X5 = 50 m/s