Question
A block of mass m takes t to slide down on a smooth inclined plane of angle of inclination and height h. If same block slids down on a rough inclined plane of same angle of inclination and some height and takes time n times of initial value, then coefficient friction between block and inclined plane is
the answer is [1- 1/n² ] tanθ
Joshi sir comment
in first case acceleration is gsinθ
and in second case acceleration is gsinθ-μgcosθ
now use s = 1/2 a t2 in both the case and solve