Use the position function s(t) = –4.9t2 + 700, which gives the height (in meters) of an object that has fallen for t seconds from a height of 700 meters. the velocity at time t = a seconds is given by the following. $ \displaystyle{\lim_{t \rightarrow a}} \text{ }\dfrac{s(a) - s(t)}{a - t} $ find the velocity of the object when t = 3.