Homework Help: calculus

Posted by bob on Tuesday, October 4, 2011 at 11:08pm.

A mass on a spring vibrates horizontally on a smooth level surface. Its equation of motion is x(t)=8sint, where t is in seconds and x in centimeter.
a. Find the velocity and acceleration at time t
b. Find the position, velocity, and acceleration of the mass at time t=2pi/3. In what direction is it moving at that time?

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