Computation. On earth, a block sitting on a frictionless, horizontal table accelerates at 7.13 m/s² when a 21-N horizontal force is applied to it. The block and table are then moved to the moon where the acceleration due to gravity is 1.64 m/s². Find the magnitude of the block's weight wm on the moon. Wm - N D Record your numerical answer below, assuming three significant figures.

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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!