A block remains in contact with the floor. A person pushes downward on the block with force Fa the block pushing on the person? a) the floor pushes on the block b) the person pushes on the floor c) the person pushes on the block d) the block pushes on the floor e) none of the above answers is correct

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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!