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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 sqrt3 ms^(-1)`

B

`20m//s`

C

`10m//s`

D

`20sqrt3 m//s `

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The correct Answer is:
D
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