本题目来源于试卷: Physics Unit6: Work and Energy,类别为 通用国际物理
[单选题]
A force moves an object ,sf1 w (wy:u/fqses4mp q*3 ta i ;yd5s woq03;md2p q,aoqlrwp8vm /m *n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w dsq2qdmqp a;r,yp/ w5o8ol m m30*v;w hen the object moves from 4.0 to 6.0 m. 
A. $20 \; J$
B. $40 \; J$
C. $60 \; J$
D. $80 \; J$
参考答案: A
本题详细解析:
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