For this exercise, use the position function s(t) = -4.9t + 250, which gives the height (in meters) of an object that has fallen for t seconds from a height of 250 meters. The velocity at time t = a seconds is given by lim s(a) - s(t) t - a a- t When will the object hit the ground? At what velocity, v, will the object impact the ground? t 4.9 S X 29.4 m/s X Need Help? Read It