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.

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jeew-m eNotes educator| 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.

 

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