1. The problem statement, all variables and given/known data Find the speed of an ocean wave whose vertical displacement y as a function of time t is given by y(x,t) = 3.7 cos(2.2x - 5.6t), where all quantities are in SI units. 2. Relevant equations v=-ωAsin(kx-ωt) 3. The attempt at a solution I'm really not at all sure where to begin with this one. I'm not even sure if my derivative equation is correct... Any direction at all would be much appreciated! Thank you!