A ball is thrown vertically upwards at 29.4 m/s. For its complete trip (up and back down to the starting position), its average speed is:
a. 14.7 m/s.
c. 4.90 m/s.
b. 9.80 m/s.
d. not given.
Question 2
A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds. She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 m/s for 80.0 seconds, reaching the ground. From what height did the parachutist jump?
a. 914 m
c. 1520 m
b. 1110 m
d. 1750 m