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 B4N V1=4m/s V2=0 Force acting on body F=ma=2×V2−V1t=2×0−42=−4N To move the body with constant velocity 4N force needs to be applied.