Problem 12 In an experiment aimed at investigation of the law of conservation, a puck of mass mi is placed stationary on a frictionless ramp at an initial height of 2.5 m, as shown below. Once released, it slides down and collides with a stationary puck of mass m2 = 2mi. Immediately after the collision, the second puck start moving along the surface with the coefficient of kinetic friction uk = 0.5 and comes to a stop at distance d. Find the distance d, assuming the collision to be fully elastic. h d Friction