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A ball is projected from the ground at a...

A ball is projected from the ground at angle `theta` with the horizontal. After `1 s`, it is moving at angle `45^@` with the horizontal and after `2 s` it is moving horizontally. What is the velocity of projection of the ball ?

A

`10sqrt3ms^(-1)`

B

`20sqrt3 ms^(-1)`

C

`10sqrt5 ms^(-1)`

D

`20sqrt2 ms^(-1)`

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The correct Answer is:
C
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