A mass m1 is placed at the bottom of a wedge of height h with opening angle and starts from rest. It is attached via a light string to a heavier mass m2 that hangs over the top of the wedge with a frictionless pulley. The coefficient of friction between the first mass and the wedge is . How much time does it take for m1 to reach the top of the wedge? Answer in terms of m1,m2,h,,,g.