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.