A piece of ice 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 ? .

A piece of ice slides down a 45^(@) incline in twice the time it takes

1.	A piece of ice 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 ? .
Answer» SOLUTION :`s=(1//2)a_(1)t_(1)^(2)=(1//2)a_(2)t_(2)^(2)`, `gsinthetat_(1)^(2)=(gsintheta-mu_(K)gcostheta)(2t_(1))^(2)`,`mu_(k)=3//4cottheta=3//4cot45=0.75`