Question

A given object takes n times as much time to slide down a 45° rough incline as it takes to slide down a perfectly smooth ${45}^o$ incline. The coefficient of kinetic friction between the object and the incline is given by

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

(a)$\mu =tan\theta (1-\frac{1}{n^2})=1-\frac{1}{n^2}[As\theta ={45}^o]$