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Question

A 10 kg mass is resting on a horizontal surface and horizontal force of 80 N is applied. If μ=0.2, the ratio of acceleration without friction and with friction is (g=10ms2)

A
34
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B
43
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C
12
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D
2
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Solution

The correct option is B 43
a1a2=FmFμmgm
a1=Fm=8010=8 m/s2
a2=Fμmgm=800.2×10×1010=6 m/s2
a1a2=86=43

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