D4 At time t, given in seconds, the position of a moving object, in meters, is given
by the equation s(t)=t^2-3t+7.
(a) Calculate the object's average velocity over the time interval [4,4.1].
Give your answer with appropriate units.
\frac{s(4.1)-s(4)}{4.1-4}
4.1-4
=0:1
(b) Calculate the object's instantaneous velocity at the time t = 4. Give
your answer with appropriate units.
(c) Calculate the object's acceleration at the time t = 4. Give your answer
with appropriate units.