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Question

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

A
8N
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B
4N
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C
0N
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D
2N
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Solution

The correct option is B 4N
V1=4m/s
V2=0
Force acting on body F=ma=2×V2V1t=2×042=4N
To move the body with constant velocity 4N force needs to be applied.
255966_280311_ans_991ec79ed1ff40e3a0bd7f715b1ae73c.png

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