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A particle performs SHM along a straight...

A particle performs SHM along a straight line and its position is `bar("R")` , acceleration is `bar(a)` , velocity is `bar(v)` is and force on particle is `bar(f)`. Then which of the following statements are true?
`hat(v)*hat(a)` is always +ve
`hat(v)*hat("R")` may be -ve
`hat(f)*hat("R")` is always -ve
`hat(v)` is parrallel to `bar(f)` sometimes

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