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A particle is projected in the X-Y plane...

A particle is projected in the `X-Y` plane. `2 sec` after projection the velocity of the particle makes an angle `45^(@)` with the `X-`axis. `4sec` after projection, it moves horizontally. Find the velocity of projection (use `g = 10 ms^(-2))`.

A

`20sqrt(5) ms^-1`

B

`10sqrt(5) ms^-1`

C

`5sqrt(5) ms^-1`

D

`2sqrt(5) ms^-1`

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The correct Answer is:
A
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