Kinematics

If the position of an object is given by x = (2.0 m/s3)t3, find
(a) the average velocity and the average acceleration between t = 1 and t = 2 s and
(b) the instantaneous velocities and the instantaneous accelerations at t = 1 and t = 2 s.
(c) Compare the average and instantaneous quantities and in each case ex­plain why the larger one is larger.