Solve. ( use 4.9t^2+vot=s)

a) A bolt falls off an airplane at an altitude of 300 m. Approximately how long does it take the bolt to reach theground?

b) A ball is thrown downward at a speed of 40m/sec from an altitude of 300 m. Approximately how long does it take the ball to reach theground?

c) Approximately how far will an object fall in 6 sec, when thrown downward at an initial velocity of 40 m/sec from aplane?