Question

A body of mass 5 kg undergoes a constant acceleration of 5

m

s

2

. Calculate the resultant

horizontal force acting on the body. What will be the resultant force when it moves with

uniform velocity of 3 m/s?

Answer 1

The resultant horizontal force acting on the body:

$$F_R=ma=5·5=25\text{ N}.$$

The resultant force when it moves with uniform velocity is zero by Newton's first law, if we ignore friction.