A puck of mass 25 grams slides across a frictionless table at a constant speed of 2 m/s. The table is 3 meters long. How much work is done by gravity as the puck moves across the table?
There is no work done by gravity. However work is done against gravity. This is given by:
(Mass of block)*(gravitational force)*(vertical movement of block)
= (Mass of block)*(gravitational force)*(s)
= 0.025*9.81*8*3 = 5.886 J
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