The change in the object’s gravitational potential energy is 2.11 J.
ΔP.E = mg(hf - hi)
where;
ΔP.E = 0.54 x 9.8(1.1 - 0.7)
ΔP.E = 2.11 J
Thus, the change in the object’s gravitational potential energy is 2.11 J.
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