The given function represents the position of a particle traveling along a horizontal line. s(t)-21²-3²-722 +3 for 120 (a) Find the velocity and acceleration functions. v(t) = 6²-61-72 a(t) 121-6 (b) Determine the time intervals when the object is slowing down or speeding up. (Enter your a slowing down (0.) u (4,00) speeding up x +