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A body of mass 40 kg resting on a rough horizontal surface is subjected to a force P which is just enough to start the motion of the body. If μs=0.5, μk=0.4, g=10ms−2and the force P is continuously applied on the body, then the acceleration of the body is

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a

zero

b

1 ms-2

c

2 ms-2

d

2.4 ms-2

answer is B.

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Detailed Solution

Force, P=fms=μsmg (when body is at rest)When the body starts moving with acceleration a, then P−fk=maμsmg−μkmg=maa=μs−μkga=(0.5−0.4)10=0.1×10 ms−2=1 ms−2

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