The equation Bold r (t )r(t)equals=(6 Bold sin t )Bold i plus (6 Bold cos t )Bold j plus (3 t )Bold k(6 sin t) i+(6 cos t) j+(3t) k is the position of a particle in space at time t. Find the particle's velocity and acceleration vectors. Then write the particle's velocity at t equals StartFraction 3 pi Over 2 EndFractiont= 3π 2 as a product of its speed and direction