Question 23951
 Given distance s=xsin(wt+alpha). 
 Show that the velocity and acceleration are 
 given by v=x cos(wt+alpha)and a=-w^2s 
 
 v = ds/dt (derivative of s wrt t)
  = x w cos (wt+alpha)(by chain rule)

 a = dv/st = -x w^2 sin(wt+alpha)= -w^2 s

 something wrong with your typing about v.


 Kenny