A $5$ kg bag of rice is lifted onto a shelf $10$ m above the ground. Find the gain in potential energy. (Take $g = 10$ m s$^{-2}$.)
A$5000$ J
B$50$ J
C$15$ J
D$500$ JCORRECT
JUPEBPhysicsWork, Energy and Power
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Why the answer is D, and why the others tempt you.
$PE = mgh = 5 \times 10 \times 10 = 500$ J. Omitting $g$ gives 50 J.
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