NEET2018PhysicsLaws of MotionActual
A force of 10 N acts on a body of mass 0.5 kg for 0.25 s starting from rest. What is its momentum now?
Options
- A0.25 ~N / s
- B2.5 ~N / s
- C0.5 ~N / s
- D0.75 ~N / s
Correct answer
B. 2.5 ~N / s
Step-by-step solution
Given, F =10 ~N , v _ i =0, ~m =0.5 ~kg , t =0.25 ~s Change in momentum, p = p _ f - p _ f aligned & p & = F t & & F t = p _ f - p _ i aligned aligned or & & 10 0.25 & = p _ f - mv _ i = p _ f -0.5 0 or & & p _ f & =2.5 ~N / s aligned