250kg roller coaster cart is at the top of a 15m hill and is moving at 30 m/s before it drops to a height of 5 m above the ground. What is the velocity of the cart at the top of this smaller hill?

Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.