The displacement y(t)=A ( t+ ) of a pendulum for = 2 3 is correctly represented by

Step-by-step solution

Displacement y(t)=A ( w t+ ) [Given] For = 2 3 at t=0 ; y=A =A 2 3 =A 120^ =0.87 ~A [ 120^ 0.866 ] Graph (a) depicts y=0.87 A at t=0