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Question

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/s comes to rest after 2 s. If one wants to keep this body moving on the same surface with a velocity of 4 m/s, the force required is:

A
8 N
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B
4 N
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C
Zero
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D
2 N
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Solution

The correct option is B 4 N
given u=4ms & t=2s
v=0
fromv=u+at
u=at
4=a(2)
a=2ms2 as the acceleration direction is opposite the sign is negative
F=ma=2(2)=4N


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