题库 Science 题目列表 Mary tried to lift her couch by exerting 500 newto...
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Mary tried to lift her couch by exerting 500 newtons of force but it doesn’t budge. If the couch weighed 2,000 newtons, how much work did she do:
A.

0

B.

50 watts

C.

500 joules

D.

2000 joules

E.

0

F.

50 watts

G.

500 joules

H.

2000 joules

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