Which of the following quantities are always negative in a simple harmonic motion ?(a) F→ . a→. (b)

Which of the following quantities are always negative in
a simple harmonic motion ?
(a) F
→
. a
→
. (b) v
→
. r
→
. (c) a
→
. r
→
. (d) F
→
. r
→
.

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