A block has acceleration a when pulled by a string. If two identical blocks are glued together and pulled with twice the original force, their acceleration will beA. (1/4)a      B. (1/2)a        C. a        D. 2a           E. 4a

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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!