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m a 3. In the experiment, you elevate the track so that its one end is sit on the table and the other end is at a height that makes the angle between the track surface to the table at 30°, as shown in Figure below. The cart mass is m= 2.0 kg. The initial position of the cart is at the bottom of the track. Given a push to the cart at initial position, the cart moves up to its highest point h = 40 cm, then it turns back down to the bottom (the initial position) (Assume the track surface is frictionless) (a) What is the gravitational potential energy when the cart reaches its highest position h? (b) What is the initial velocity of the cart at bottom being pushed? (c) What is the kinetic energy when the cart climbs to 1/3 of its maximum height h? (d) What is the total energy as the cart moves up and down along the track? h m