velocity of a particle moving in the xy plane is given by v =
[(6.0m/s2)t - (4.0 m/s3)t2]i + (8.0 m/s)j.
Assume t > O.
What is the acceleration when t = 3 s?
(b) When (if ever) is
the acceleration zero?
(c) When (if ever) is the ve¬locity zero?
When (if ever)does the speed equal 10 m/s?