thank you.
Q.3. For a certain transverse standing wave on a long string, an antinode is formed at x = 0 and next to it, a node is formed at x = 0.10 m. The displacement y(t) of the string particle at x = 0 is shown in figure.

(A) Transverse displacement of the particle at x = 0.05 m and t = 0.05 s is - 2$\sqrt{2}$ cm.
(B) Transverse displacement of the particle at x = 0.04 m and t = 0.025 s is - 2$\sqrt{2}$ cm.
(C) Speed of the travelling waves that interfere to produce this standing wave is 2 m/s.
(D) The transverse velocity of the string particle at x = $\frac{1}{15}$ m and t = 0.1 s is 20$\mathrm{\pi }$ cm/s