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A parachutist drops from an aeroplane fo...

A parachutist drops from an aeroplane for `10s` before the parachute opens out. Then he descends with a net retardation of `2.5ms^(-2)`. If he bails out of plane at a height of `2495m` and `g=10ms^(-2)`, his velocity on reaching the ground will ve

A

`2.5ms^(-1)`

B

`7.5ms^(-1)`

C

`5ms^(-1)`

D

`10ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
Distance covered in first `10 sec`
`S_(i)=(1)/(2)(10)(10)^(2)=500m`
Remaining height from ground `=2495-500=1995m`
`u=gt=10xx10=100m//s` velocity on reaching the ground
`v^(2)=(100)^(2)+2(-2.5)xx1995`
`v^(2)=10000-9975=25`
`v=5m//s`.
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