A paratrooper jumps from an aeroplane and opens a parachute after 2 s of free fall and starts deaccelerating with 
. At 10 m height from ground, while descending with the help of parachute, the speed of paratrooper is 
- The initial height of the airplane is 
m. 
Text Solution
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During the first 2 s of free fall, the paratrooper starts from rest ( 
).
Velocity after 2 s is 
.
Distance covered during free fall is 
.
After opening the parachute, the paratrooper decelerates at 
.
At a height of 10 m from the ground, the final velocity is 
.
Let 
be the distance covered during deceleration until reaching 10 m height.
Using 
:
.
The total height of the airplane is the sum of the free fall distance, the deceleration distance, and the remaining height from the ground.
.
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