CU 2009 sp exam3

# CU 2009 sp exam3 - 1 of 11 Exam III vers 0001 Physics 2010...

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2 of 11 vers 0001 5/1/2009 1. A box of mass m = 10 kg is lifted up (against gravity) at a constant velocity for a distance of 5 m. How much work was done in lifting the box? A) 490 J B) -50 J C) 50 J D) -980 J E) -490 J 2. A 1000 kg car brakes to a stop from an initial speed of 30 m/s. How much work was done on the car to get it to stop? A) 9.0 x 10 5 J B) 3.0 x 10 4 J C) 3.0 x 10 4 kg m/s D) 4.5 x 10 5 J E) 4.5 x 10 4 J
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