Q.

A block is pushed up a rough inclined plane of 450 .If the time of descent is twice the time of ascent, the coefficient of friction is

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a

0.6

b

0.4

c

0.5

d

0.25

answer is A.

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Detailed Solution

2lg(sin450−μcos450) =22lg(sin450+μcos450)⇒μ=0.6
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A block is pushed up a rough inclined plane of 450 .If the time of descent is twice the time of ascent, the coefficient of friction is