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Q.

A body of mass 60 kg is pushed up with just enough force to start in moving on a rough surface with μs = 0.5 and μk = 0.4 and the force continues to act afterwards. What is the acceleration of the body ?

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a

14.7 ms-2

b

1.96 ms-2

c

0.98 ms-2

d

4.9 ms-2

answer is C.

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Detailed Solution

F = Applied force = fs=μsmg
Fnet=F-fk=μsmg-μkmg
a = (μs-μk)g = (0.5 - 0.4)9.8 = 0.98 ms-2

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