A pair of skydivers jump out of an airplane 5.5 km above the ground. The equation H=5500- 5t^2 is an approximate model for the divers' altitude in metres at t seconds after jumping out of the plane. (a) After 10 s how far have the divers fallen? (b) They open their chutes at an altitude of 1000 m. How long did they free-fall? (c)If a parachute does not open at 1000 m, how much time is left to use the emergency chute?
a) substitute t = 10 into the equation to find their height at ten seconds
subtract this height from 5500 to find how far they have falllen
b) sbstitute 1000 for H then solve for t in the equation
c) h will = 0 when they smack into the ground if they do not open a chute
use H = 0 to find the total time to fall from the plane to the ground
then subtract the answer from b to find how much time is left !