91. In a physics experiment, students made a lab cart of a wooden block of mass 5m and four wheels each of mass, m and radius r. The moment of inertia of each wheel is I = 1 2 mr2 . The cart is released from rest and rolls without slipping from the top of an inclined plane of height h. After the cart reaches the bottom of the inclined plane, it collides with an elastic spring with negligible mass and a spring constant k. . Present all results in terms of m, r, g, and h