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Two seconds after projection, a projecti...

Two seconds after projection, a projectile is moving at `30^@` above the horizontal. After one more second it is moving horizontally. If `g = 10ms^(-2)`, the velocity of projection is

A

`10 sqrt(3) ms^(-1)`

B

`20 m//s`

C

`10 m//s`

D

`20 sqrt(3) m//s`

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The correct Answer is:
D
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