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The vector ` vec a` has the components `2p` and 1 w.r.t. a rectangular Cartesian system. This system is rotated through a certain angel about the origin in the counterclockwise sense. If, with respect to a new system, ` vec a` has components `(p+1)a n d1` , then `p` is equal to a. `-4` b. `-1//3` c. `1` d. `2`

A

p = 0

B

p = 1 or p = 1/3

C

p = 1 or p = 1/3

D

p = 1 or p = -1

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The correct Answer is:
C
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