Question

A force exerts an impulse I on a particle changing its speed from u to 2u. the applied force and the in itial velocity are oppositely directed along the same line. The work done by the force is

(C) I u 

(D) 2 I u

Answer 1

Correct option: (B)

Explanation:

I = ΔP

I = 2mu – (–mu)

I = 3mu ...(i)

According to work energy theorem

From equation (i) and (ii)