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A parachutist drops first freely from a...

A parachutist drops first freely from a plane for `10 s` and then his parachute opens out. Now he descends with a net retardation of `2.5 ms^(-2)` If he bail out of the plane at a height of `2495 m` and `g=10 ms^(-2)`, his velocity on reaching the ground will be`.

A

2.5 m/s

B

7.5 m/s

C

5 m/s

D

10 m/s

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The correct Answer is:
C
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