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Sun 6 Jan, 2013 02:07 pm
A steady stream of 15 balls per second (50 grams each), rolls from a horizontal table and falls through a height of 1 m onto the top of a scale as shown. The scale responds slowly and so reads the average force which in this case is 6N. TO WHAT HEIGHT H DO THE BALLS REBOUND? (they each make only one collision with the scale)