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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

5 m/s

B

10m/s

C

15m/s

D

20m/s

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The correct Answer is:
A
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