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Which of the following quantities are always positive in a S H M

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a
Fa¯
b
a¯r¯
c
v¯r¯
d
F¯r¯

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detailed solution

Correct option is A

Fa¯=m(a¯a)=ma2a2= always+ve m=always +ve, so Fa¯ is + ve 

Force or acceleration and displacement are  always in opposite direction hence so F.r or a.r are always negative

V and r sometimes in the same direction sometimes in opposite direction so it could be +ve or -ve.

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