Path Dependence


A 5-kg block is lifted from rest by an external agent, then returned to its original position as shown in Animation 1 (position is in meters and time is in seconds). An identical block is pushed along the surface which has a coefficient of kinetic friction of  0.2. As with the first block, it is returned to its original position in Animation 2.
Determine the work done by gravity in Animation 1 and the work done by friction in Animation 2.


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