5. A ball is thrown into the air. The height of the ball above the ground can be modelled by the function h(t) =8tt2,ostgs where t is the time in seconds and h(t) is the height above the ground in metres. a. Determine the average velocity of the ball from t = 1 to t = 3 seconds. b. Determine the instantaneous velocity of the ball at t = 3 seconds. Remember that the instantaneous velocity is the slope of the tangent