# physics

A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do? (1 kg has a weight of 9.81 N.)

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1. 1 tonne is 1000 kg. Multiply the weight (in Newtons) by 25 m.

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posted by drwls
2. 2500

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posted by Amelia

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