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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.
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Solution
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.
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