Suppose there is a correction term to Newton's law of universal gravitation where the letters have their usual meaning  and are given in SI units and, in particular, r is the separation  distance between the two masses m1 and m2 and A is some new constant of nature. Find the units of  this constant A.

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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!