A man lifts a 40 kg mass vertically through 1 m in 10 s, while a child lifts a 10 kg mass vertically through 1 m in 1 s. Which conclusion is correct?
Correct answer A. The man does more work than the child
Explanation
Work is mgh regardless of time: the man does 40 × 9.8 × 1 = 392 J while the child does only 98 J, although the child develops more power.
Answer checked How we write and check questions
Discussion