If the mass of a coin is 2.5 g, how much work does it take to carry it from ground level to the top of a 300 m tall skyscraper?
A. 7.4 J
B. 7400 J
C. -7.4 J
D. -7400 J
E. 0 J
A. Correct. Although the distance traveled is high, the small mass keeps the work required low.
B. Incorrect. It appears you forgot a conversion factor. Carefully redo your calculation and watch the units.
C. Incorrect. This sign is incorrect. Energy is being added to the dime because it is moving against gravity.
D. Incorrect. This sign is incorrect. Energy is being added to the dime because it is moving against gravity.
E. Incorrect. Work is definitely being done to move the dime against the gravitational downward force.
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