A projectile is fired vertically upward into the air, and its position (in feet) above the ground after t seconds is given by the function s(t) = - 16t + 140t. a. For s(t), find the instantaneous velocity function v(t). (Recall that the velocity function v is the derivative of the position function s.) b. Determine the instantaneous velocity of the projectile att=1 and t= 3 seconds. a. v(t) = b. At t= 1, the instantaneous velocity is (Type an integer or a simplified fraction.) At t= 3, the instantaneous velocity is (Type an integer or a simplified fraction.)

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