A 5 kg object is lifted vertically at constant speed through a height of 2 m. How much work is done against gravity? (Take g = 10 m/s²)
Show the answer and explanation
Correct answer
C. 100 J
Principle or equation
Work done against gravity = mgh.
Why this answer is correct
W = 5 kg × 10 m/s² × 2 m = 100 J.
Example
Lifting a 2 kg mass 3 m requires 2×10×3 = 60 J.
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