A man doing push-ups pauses in the position shown in the figure. His mass is m=72.0kg. 1. Draw a free body diagram of the man. 2. Determine the normal force exerted by the floor on each hand and on each foot (assume that the forces on the hands are evenly distributed, and the same is true for the forceson the feet).

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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?”