2. (5 pts) The velocity of an object moving along a straight line changes with time according

to the following function:

v(t) = ½t² + 8 ln(3t) + 10-sin(5t) [valid for t> 0.1 s; units: m/s]

(a) Determine the instantaneous acceleration of the object at time t = 6 s.

(b) Determine the average acceleration of the object between t = 4s and t = 5 s.