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A man lifts a 20 kg box vertically upward with a constant velocity of 0.5 m/s. How much work is done in lifting the box through a height of 5 meters? (Assume g = 9.81 m/s²)
Group of answer choices
A. 490.5 J
B. 981 J
C. 1962 J
D. 245.25 J

Sagot :

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