1. The problem statement, all variables and given/known data My professor has given us a pset with this problem: A plane mechanical wave is represented by the equation [itex]y = 30 sin(30\pi t + 0.03 \pi x)[/itex] Where [itex]y[/itex] is measured in cm, [itex]x[/itex] is measured in metres and time [itex](t)[/itex] is measured in seconds. Find (i)amplitude of particle velocity (ii)wave-velocity 2. Relevant equations 3. The attempt at a solution While I know how to find (ii), I don't know how to find out (i). Can somebody please tell me ?