A sinusoidal wave has an amplitude of 3cm. Time period is 1s. The wavelength is 1cm. And at x = 0, t=0 the particle is at its mean position & moving upwards. What is the equation of the wave if it is travelling along the positive x-axis?

• A. y = 3sin(2 x 2 t)
• B. y = 3sin(2 t 2 x)
• C. x = 3sin(2 t 2 y)
• D. y = 3cos( + 2 t 2 x)