Question
A book with printing error contains four different formulae for displacement. Choose the correct formula/formulae (a) $y=a \sin \frac{2 \pi}{ T } t$
(b) $y=a \sin v t$
(c) $y=\frac{a}{ T } \sin \left(\frac{t}{a}\right)$
(d) $y=\frac{a}{T}\left(\sin \frac{2 \pi}{ T } t+\cos \frac{2 \pi}{ T } t\right)$
(b) $y=a \sin v t$
(c) $y=\frac{a}{ T } \sin \left(\frac{t}{a}\right)$
(d) $y=\frac{a}{T}\left(\sin \frac{2 \pi}{ T } t+\cos \frac{2 \pi}{ T } t\right)$