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Ive been working on some oscillation problems and i got a couple of them correct (im suspecting flukes) but i can't get past this one:

The position of a mass that is oscillating on a spring is given by (17.5cm)cos[(11.0s^-1)t].

What is the speed of the mass when t = 0.820 s?

I believe I am supposed to use V = dx/dt = -A*w*sin(w*t + fi)

where A is amplitude, w is angular frequency t is time and fi is the phase constant. i think I am really having a problem understanding how to get the phase constant.

p.s. this is my first post and I'm only looking for a point in the right direction, not a completed solution. :D

cheers