If an object is thrown upward at 128 feet per second from a height of 36 feet, its height S after t seconds is given by the following equation. S(t) = 36 + 128t − 16t2 (a) What is the average velocity in the first 4 seconds after it is thrown? ft/sec (b) What is the average velocity in the next 4 seconds? ft/sec

When a skydiver jumps from an airplane, his downward velocity, in feet per second, before he opens his parachute is given by  v = 176(1 − 0.834t ),  where t is the number of seconds that have elapsed since he jumped from the airplane. What is the velocity after 6 seconds? (Round your answer to two decimal places.) ft/s

A runner runs in a straight line and their distance traveled at time t is given by the formula d(t)=3t-0.05t2, where distance is in feet and t is in minutes.  Find the runners' average speed during the 2-minute interval beginning at time t=1. ANSWER:  ________ feet per minute  If rounding is necessary, round to two digits after the decimal.