A shown in the figure, a block weighing 1.0 N can possibly have three positions.

Question

A shown in the figure, a block weighing 1.0 N can possibly have three positions. One position is at the top of a 20-m hill, one position is at ground level, and one position is at the bottom of a 10-m deep well. Consider the gravitational potential energy of the system consisting of the Earth and this 1.0-N block. If the bottom of the well were selected as the block location for which the potential energy of this system would be called zero, then the possible potential energy values for this system would be:

block at top of hill: +30 J

block at ground level: +10 J

block at bottom of well: 0 J

Suppose instead that ground level were selected as the location of the block for which the system potential energy would be called zero. For this choice, what would be the possible potential energy values for this system?

Arrange your answers as an ordered triple, with potential energy for block at top of hill first, followed by a comma, followed by potential energy for block at ground level, followed by a comma, followed by potential energy for block at bottom of well.

block at bottom of well: 0 J Suppose instead that ground level were selected as the location of the block for which the system potential energy w 20 m Im

Explanation / Answer

According to the given problem,

Now, the ground level was selected as the block location for which the potential energy of this system would be called zero

Which results in,

block at top of hill: +20 J [1N*20m = 20J]

block at ground level: 0 J [given in the question]

block at bottom of well: -10 J [1N*(-10m) = -10J].

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