Question:
A particle is subjected to two simple harmonic motions of same time period in the same direction. The amplitude of the first motion is $3.0 \mathrm{~cm}$ and that of the second is $4.0 \mathrm{~cm}$. Find the resultant amplitude if the phase difference between the motions is
(a) $0^{\circ}$,
(b) $60^{\circ}$,
(c) $90^{\circ}$.
Solution:
