An object is placed on the surface of a smooth inclined plane of inclination . It takes time t to reach the bottom of the inclined plane. If the same object is allowed to slide down rough inclined plane of same inclination , it takes time nt to reach the bottom where n is a number greater than 1. The coefficient of friction  is given by -

An object is placed on the surface of a smooth inclined plane of inclination theta . It takes time t to reach the bottom of the inclined plane. If the same object is allowed to slide down rough inclined plane of same inclination theta , it takes time nt to reach the bottom where n is a number greater than 1. The coefficient of friction mu is given by -

An object is placed on the surface of a smooth inclined plane of inclination theta . It takes time t to reach the bottom of the inclined plane. If the same object is allowed to slide down rough inclined plane of same inclination theta , it takes time nt to reach the bottom where n is a number greater than 1. The coefficient of friction mu is given by -

An object is placed on the surface of smooth inclined plane of inclination . It takes time to reach the bottom. If the same object is allowed to slide down the rough inclined plane of the same inclination, the time to reach the bottom is increased n times, where n gt 1 . The coefficient of friction for the plane is :

A block moves down a smooth inclined plane of inclination theta . Its velocity on reaching the bottom is v. If it slides down a rough inclined plane of some inclination, its velocity on reaching the bottom is v/n, where n is a number greater than 0. The coefficient of friction is given by -

A block moves down a smooth inclined plane of inclination theta . Its velocity on reaching the bottom is v. If it slides down a rough inclined plane of some inclination, its velocity on reaching the bottom is v/n, where n is a number greater than 0. The coefficient of friction is given by -