Sky divers jump out of a plane of an altitude of 4000m. How much time will pass until they deploy their parachutes of an altitude of 760 m?Assume their air resistance is neglible.
jeew-m | Certified Educator
Using `S = ut+1/2*a*t^2`
S = 4000-760 = 3240m
a = 9.81m/s^2 (diver fall under gravity)
u = 0 m/s (since diver starts a free fall)
3240 = 0*t+1/2*9.81*t^2
t^2 = 660.550 s^2
t = 25.70 s
So the diver falls 25.7 s before he deploy the parachute.