ap physics B help.

ap physics B help.

题目
ap physics B help.
vector A has a magnitude of 10 units and makes an angle of 30degree with the horizontal x-axis.vector B has a magnitude of 25 units and makes an angle of 50degree with the negative x-axis.what is the magnitude of the resultant between these two vectors?
A.20
B.35
C.15
D.45
E.25
(本题出自barron AP physics B page 62-5)
答案
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