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Question

A force of 12 N acts on a body of mass 4 kg resting on a rough surface (coefficient of friction is 0.2 and g=10ms−2) The acceleration of the body in ms−2 is

A
1
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B
0.5
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C
0.25
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D
zero
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Solution

The correct option is A 1
For a block in equilibrium,
Equating forces along Yaxis,
Normal reaction, N=mg
Equating forces along Xaxis,
ma=Ff
where f=μmg
ma=Fμmg
a=Fμmgm
a=120.2×4×104
a=1284
a=44
a=1 ms2
129212_6221_ans_ba6a848b96464321ad10801c203cd284.png

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