Question

sky divers jump out of planes at an altitude of 4000m. How much timewill passuntill they deploy their parachutes at an altitutde of 760m?

Answer 1

Answer:

Explanation:

Given

Altitude from which Diver steps out $H=4000\ m$

altitude at which diver opens the Parachutes $h=760\ m$

total height covered by diver$=H-h=4000-760=3240\ m$

Initial velocity of diver is zero

using equation of motion

$s=ut+\frac{1}{2}at^2$

where s=displacement

u=initial velocity

a=acceleration

t=time

$3240=0+\frac{1}{2}\times 9.8\times t^2$

$t^2=661.224$

$t=25.71\ s$