Which of the following quantities is/are always non-negative in a simple harmonic motion along a straight line?

Options

A. `vec(F).vec(a)`
B. `vec(v).vec(r)`
C. `vec(a).vec(r)`
D. `vec(F).vec(r)`

Answer

A

Explanation

`vec(F).vec(a)=mvec(a).vec(a)` [ it is always non-negative]