A particle moves according to the law of motion 4 2 __i tEUi s: t2 t where t is measured in seconds and 3 in feet. (a) Find the average velocity over the interval [1, 2] t Answer: 2 f S (to) Find the velocity at time t. t Answer: 2 f S (c) What is the velocity after 1 seconds? i Answer: I f s (d) What is the acceleration after 2 seconds? t Answer: 2 f 32 (e) For t > 0: when is the particle moving in the negative direction