Problem #1: A cannonball is fired off a cliff at an angle of 25 degrees with respect to the horizontal. The cliff is 80 m high. The initial speed of the rock is 50 m/s. (a) How high above the edge of the cliff does the rock rise? (b) How far has it moved horizontally when it is at maximum altitude? (c) How long after the release does it hit the ground? (d) What is the range of the rock? (e) When the cannonball hits the ground what is the magnitude of its total velocity?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”