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.