question_answer

The displacement \[y(t)=A\sin (\omega t+\phi )\] of a pendulum for \[\phi =\frac{2\pi }{3}\] is correctly represented by [JEE ONLINE 19-05-2012]

A)  

B)       

C)  

D)       

Correct Answer: A

Solution :

[a] Displacement [Given]

For at

Graph [a] depicts y = 0.87.4 at t = 0