A piece of ics slides down a 45^(@) incl...

A piece of ics slides down a `45^(@)` incline in twice the time it takes to slide down a frictionless `45^(@)` incline . What is the coefficient of friction between the ice and the incline ? .

`(3)/(7cot theta)`

`(4)/(7cot theta)`

`(3)/(4cot theta)`

`(7)/(9cot theta)`

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