Question

A body of mass 500 g, initially at rest, is acted upon by a force which causes it to move a distance of 4 m in 2 s, Calculate the force applied.

Answer 1

Mass of an object = 500 g = 0.5 kg

The second equation of motion is 

s = `(ut) + 1/2 at^2`

As the body is at rest, u = 0,

t = 2 s

Displacement of an object = 4 m

`4 = (0) xx (2) + 1/2 a (2)^2`

a = 2 m/s²

F = m × a

= 0.5 × 2

= 1 Newton

Thus, the force applied to move the body is 1 Newton.