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A body is projected horizontally from a ...

A body is projected horizontally from a height of 78.4 m with a velocity 10 `ms^(-1)` . Its velocity after 3 seconds is [g = 10 `ms^(-2)`] (Take direction of projection on `veci` and vertically upward direction on j)

A

`10hati - 30 hatj`

B

`10hati + 30 hatj`

C

`20hati - 30 hatj`

D

`10hati + 10sqrt(3) hatj`

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The correct Answer is:
A
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