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## Homework Statement

A transverse traveling wave on a cord is represented by D = 0.48 sin (5.6x + 84t) where D and x are in meters and t in seconds. Determine the maximum and minimum speeds of particles of the cord.

## The Attempt at a Solution

I'm guessing these speeds are found by the partial time derivatives of D:

dD/dt = 40.32 cos (5.6x + 84t).

Is this right?

So the answer is 40.32 m/s??