i + If a rock is thrown upward on the planet mars with a velocity of 14 meter per second, its position after t seconds is given by the function s(t) = -3.15t2 + 14t The velocity at time t = a seconds is given by the following: s (t) - s(a) lim t-+ a t - a Find the velocity of the rock when t = 2. (Enter exact numerical answer.) Answer: Finish atte age