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A certain vector in the $xy$ plane has an $x$ component of 4 m and any component of 10 m. It is then rotated in the $xy$ plane so that its $x-$ component is doubled. Then its new y component is (approximately):

\[\begin {array} {1 1} (a)\;20\;m & \quad (b)\;7.2\;m \\ (c)\;5.0\;m & \quad (d)\;4.5 \;m \end {array}\]

1 Answer

(b) 7.2 m
answered Nov 7, 2013 by pady_1
 

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