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Which of the following quantities are al...

Which of the following quantities are always zero in a S.H.M. ? Here, `vec(r),vec(upsilon)`and `vec(a)` represent amplitude, velocity and acceleration vectore.

A

`vec(r)xxvec(upsilon)`

B

`vec(r)xxvec(a)`

C

`vec(a)xxvec(F)`

D

`vec(r)xxvec(F)`

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The correct Answer is:
A, B, C, D
act along the same straight line either in the same direction of in opposite direction. So angle between each two vectors, `i.e., theta` is either zero of `180^(@0` and sin `180^(@0` both are zero.
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