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Answer :
The gravitational potential energy of the object is -176J. Option 4 is the answer.
How The answer was obtained
The gravitational potential energy (U) of an object of mass (m) at a height (h) relative to a reference point where gravitational potential energy is defined to be zero is given by:
U = mgh
where g is the acceleration due to gravity (9.81 m/s^2).
In this problem, the object is 3.00 m below the ground relative to a point 5.00 m below the ground. So, the height of the object relative to the reference point is:
h = -3.00 m - (-5.00 m) = 2.00 m
Note that we use a negative sign for h because the object is below the reference point.
Plugging in the values, we get:
U = (9.00 kg) x (9.81 m/s^2) x (-2.00 m) = -176.22 J
Rounding off to two significant figures, the gravitational potential energy of the object is -176 J. Therefore, the answer is -176J.
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