(a) If the position of a particle is given by x = 17t - 4t3, where t>_0 is in seconds and x is in meters, when is the particle's velocity zero? (b) When is its acceleration a zero? (a) If the position of a particle is given by x = 177-41, wheret > 0 is in seconds and x is in meters, when is the particle's velocity zero?(b) When is its acceleration a zero? (a) Number 1 Units (b) Number Units