# A wedge of mass 2m and a cube of mass m are shown in figure. Between cube and wedge, there is no friction. The minimum coefficient of friction between wedge and ground so that wedge does not move is: a.0.20 b.0.25 c.0.10 d.0.50

F = mgcos(45)sin(45) = mg/2

now normal reaction from ground

that is N = 2mg+mg(cos45)^2 = 2mg+mg/2 = 5mg/2.

now equate UN=F Here, U is coefficent of friction

And U comes out to be 0.2