Question

A 50 N force is used to push a 0.65 kg metal ball from rest. If the force is applied on the ball for 0.25 seconds, what will be its final velocity?

Answer 1

$$\Delta p=m\Delta v=F\Delta t$$

$$v_f=F\Delta t/m=50*0.25/0.65=19.2\:\rm m/s$$