If R(t) Is the Position Vector of a Particle in the Plane

question 141

Multiple Choice

If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.
-Find the acceleration vector. r(t) = (6 cos t) i + (9 sin t) j

• A) a = (6 cos t)i + (9 sin t)j
• B) a = (-6 cos t)i + (-9 sin t)j
• C) a = (-6 sin t)i + (-9 cos t)j
• D) a = (6 sin t)i + (9 cos t)j