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A body of mass 3 kg at rest is acted upo...

A body of mass 3 kg at rest is acted upon by a force and the body moves through a distance 20 m in 5 s. Force on the body is

A

4.8 N

B

2.4 N

C

60 N

D

10 N

Text Solution

Verified by Experts

The correct Answer is:
A
Here, m = 3 kg, u = 0, s = 20 m, t = 5s
Using kinematic equation, `s = ut +1/2 at^2`
`20 = 0 xx 5 + 1/2 xx a xx (5)^2 or 40 = 25a or a = 40/25 = 8/5 ms^(-2)`
` therefore F = ma = 3 xx 8/5 = 24/5 = 4.8 N`
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