An object of mass m is dropped from the roof of a buildingof height h. While the object is falling, a wind blowingparallel to the face of the building exerts a constanthorizontal force F on the object. (a) How long does it takethe object to strike the ground? Express the time t in termsof g and h. (b) Find an expression in terms of m and F forthe acceleration ax of the object in the horizontal direction(taken as the positive x - direction). (c) How far is the objectdisplaced horizontally before hitting the ground? Answer interms of m, g, F, and h. (d) Find the magnitude of the object’sacceleration while it is falling, using the variables F, m, and g.

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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?”