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BMAT考试：科学知识与应用练习

The graph shows the variation with time of the height through which acrane lifts a mass of 20 kg.

Assume the gravitational field strength g is 10 N/kg, and that the effects of air resistance and friction are negligible.

What is the power output of the crane when the massis at a height of 10 m?

A 0.1 W

B 10 W

C 40 W

D 100 W

E 400W

F 4000W

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