A) zero
B) 2.0 m/s
C) 0.3m/s
D) 0.4 m/s
Correct Answer: A
Solution :
\[y=A\,\,\sin \,\omega t\] \[\frac{dy}{dt}=v=A\omega \,\,\cos (\omega t)\] \[=A\times \frac{2\pi }{T}\cos \left( \frac{2\pi }{T}t \right)\] \[=\frac{2\pi \times 0.1}{4}\cos \frac{2\pi \times 1}{4}\] \[=\frac{2\pi \times 0.1}{4}\cos \frac{\pi }{4}=0\]
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