还有一道英文物理题an air-filled ballon floating on the surface of the
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还有一道英文物理题
an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:
A.Vc+Vw
B.Vc-Vw
C.Vw-Vc
D./Vc/-/Vw/
E./Vw/-/Vc/
pls tell me why
an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:
A.Vc+Vw
B.Vc-Vw
C.Vw-Vc
D./Vc/-/Vw/
E./Vw/-/Vc/
pls tell me why
你可以设一个正方向啊.要是相反正好减去,相同的时候减去一个负的不就等于加上正的么.所以选加绝对值的那个,去掉绝对值可以带一负号,不知道你懂了没有.体会下
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