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A piece of ice slides down a rough incl...

A piece of ice slides down a rough inclined plane at `45^(@)` inclination in twice the time that it takes to slide down an identical but frictionless inclined plane. What is the coefficient of friction between ice and incline ?

A

`(3)/(7 cot theta)`

B

`(4)/(7 cot theta)`

C

`(3)/(4 cot theta)`

D

`(7)/(9 cot theta)`

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The correct Answer is:
C
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