Question

A body takes 4/3 times as much time to slide down a rough inclined plane as it takes to slide down an identical but smooth inclined plane.If the angle of inclinician is 45° find the coefficient of friction

Answer 1

Explanation:

accelarion along the downward direction of wedge

 a1=(mgsin45-μmgcos45)/m

    =(1-μ)g/√2

let total time taken is t

s=0*t +.5(a1)t^2

 when wedge is frictionles

then acceleration

a2=g/√2

s=0*t/2 +.5(a2)*(t/2)^2

equate both value of s

μ=3/4

Please 

Answer 2

Explanation:

yes he is right .........,