Hi! If anyone could help me with this problem I'd be deeply appreciative: Speed of Propagation vs. Particle Speed. The equation y(x,t)=A cos2(pi)f (x/v - t) may be written as y(x,t)= A cos[(2(pi)/lamda)(x-vt)] a) Use the last expression for y(x,t) to find an expression for the transverse velocity v_y of a particle in the string of which the wave travels. b) Find the maximum speed of a particle of the string? I really have no idea how I'm even meant to approach this problem... Anyone know how to figure it out? Thanks!