Question

A force of 10 Newton starts acting on a body kept at rest. Find the momentum of the body at 5 seconds after the four starts acting?​

Answer 1

Question:

A force of 10 Newton starts acting on a body kept at rest. Find the momentum of the body at 5 seconds after the four starts acting?​

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Answer:

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

F = ma

=> 10 = ma

=> a = 10/m

Initial velocity at t= 1 will be zero

Velocity after 1 s = 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) x 5 = 50 Ns or 50 Kgm/s

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