A man is standing in a low-ceiling cave. He has raised his arms and pushing against the ceiling with a force of 300 N. His mass is 75 kg. What force does the ceiling exert on him?    Question options:   A)  250 N   B)  100 N   C)  500 N   D)  200 N   E)  300 N

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Q: In physics, what is the finest use of inferential calculus?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!