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Q1. A 15.00 block is attached to a very light horizontal spring of force constant 450 and is resting on a smooth horizontal table. Suddenly it is struck by a 3 stone travelling horizontally at 8 to the right, whereupon the stone rebounds at 2.00 horizontally to the left.

Q2. At a construction site, a 66.00 bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 83.0 box on a horizontal roof .The cable pulls horizontally on box, and a 48 bag of gravel rests on top of the box. The coefficients of friction between the box and roof are shown. The system is not moving.

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