A Ball Is Thrown Straight Up $h ( t ) = 30 t - 16 t ^ { 2 } + 6$

Short Answer

A ball is thrown straight up. Its height, in feet, at time t, in seconds, is represented by the equation $h ( t ) = 30 t - 16 t ^ { 2 } + 6$ . Determine the instantaneous velocity of the ball at $t = 2$ .
Enter just an integer (no units)