Over the course of the 4 hours for which farmer Joe's tractor is pulling the heavy plow, the plow is gaining energy by virtue of its displacement --termed the Kinetic energy.
According to the question, Farmer Joe drives the tractor for 4 hours.
However, the tractor is connected to a heavy plow and is used to pull the plow across a rocky field.
The question requires that we determine if the plow is gaining or losing energy.
- In the plow's state of rest, prior to when it is connected to the tractor and pulled by the tractor; the plow possess a form of energy by virtue of its position termed the Potential energy.
However, the focus of the question is during the pulling action of the tractor on the plow.
- As such, the plow now has a kinetic energy by virtue of its displacement..
Ultimately, the plow is gaining energy as it is being pulled by the tractor and now has Kinetic energy.
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