Question

A force of P N acting on a body of 5kg traveling with a velocity of 5ms^-1 increases it velocity to 10ms^-1. if the force acts in the direction of motion for a period of 5s, what is the value of P?

Answer 1

Given:

$m=5\:\rm kg$

$v_1=5\:\rm m/s$

$v_2=10\:\rm m/s$

$\Delta t=5\:\rm s$

The Newton's second law says

$$F=m\frac{\Delta v}{\Delta t}=5*\frac{10-5}{5}=5\:\rm N$$