Which of the following quantities are always negative in a $SHM$
A$\vec F.\vec a$
B$\vec a.\vec r$
C$\vec v.\vec r$
D$\vec v.\vec F$
Easy
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B$\vec a.\vec r$
b Direction of Displacement and acceleration is always opposite
So, $\boxed{\vec a.\vec r = - \,ve}$
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