A sinusoidal wave of wavelength 7.5 cm travels a distance of 1.2 cm along the x -direction in 0.3 sec. The crest P is at x=0 at t =0 sec and maximum…

A sinusoidal wave of wavelength $\displaystyle 7.5$ cm travels a distance of $\displaystyle 1.2$ cm along the $\displaystyle x$-direction in $\displaystyle 0.3$ sec . The crest P is at $\displaystyle x=0$ at $\displaystyle \mathrm{t}=0 \mathrm{sec}$ and maximum displacement of the wave is $\displaystyle 2$ cm . Which equation correctly represents this wave ?