1. (20 pts) Meg tosses a stone upwards. The height of the stone, h after time t seconds is given by: h(t) =-16t2 +56t+80, where h is measured in feet. a) Compute the average velocity of the stone on the interval [2, 4]. b) Write down a formula that represents the stone's instantaneous velocity v(t) after t seconds. c) Determine the time when the stone attains its maximum height. d) Determine the maximum height of the stone. e) Determine the time when the stone hits the ground. f) Determine the instantaneous velocity of the stone when it hits the ground