How much work is required to lift a 10.-newton weight 10 meters above the surface of
Earth?

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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their crystal patterns have been disrupted by stress

0.11 m/s and 0.28 m/s should be correct

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