calculus
posted by Belinda .
If an equation of motion of a particle is given by s(t)= Acos(ùt + ä), the particle is said to undergo simple harmonic motion. Find the velocity of the particle at time t. When is the velocity 0?

the velocity at time t is the derivative.
the derivative of s(t) with respect to t =
A*sin(ùt + ä)(t) assuming that everything but t and s(t) are constent.
to find out when the velocity is 0 we just have to set the derivative = to 0 and solve for t so it looks like the velocity is 0 whent t=0 A=0 or sin(u*t+a)=0