A weightlifter raises a 60 kg barbell through 1.8 m at a steady speed. Taking the gravitational field strength as 9.8 N/kg, how much work is done against gravity?

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Question

A weightlifter raises a 60 kg barbell through 1.8 m at a steady speed. Taking the gravitational field strength as 9.8 N/kg, how much work is done against gravity?

Accepted Answer

1 058.4 J — 4 J. Award 1 mark. The weight lifted is 60 kg × 9.8 N/kg = 588 N, and the work done is 588 N × 1.8 m = 1 058.4 J. Stopping at 588 gives the force rather than the work, and using the mass in place of the weight gives 108 J.

Answer

588 J

Answer

1 058.4 J

Answer

108 J

Answer

336 J

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