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Question

A block of mass m is kept on an inclined plane of a lift moving down with acceleration of 2 m/s2. What should be the coefficient of friction for the block to move down with constant velocity relative to lift?

A
μ=13
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B
μ=0.4
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C
μ=0.8
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D
μ=0.5
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Solution

The correct option is A μ=13
Effective acceleration due to gravity is
geff=g2=8 m/s2
Along inclined plane [for constant velocity w.r.t lift]
m(ga)sin θ=μm(ga)cos θ
μ=tan θ=tan 30=13

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