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A ball is thrown horizontally from a height of `20m`.If hits the ground with a velocity of `3` times the velocity of projection.The velocity of projection is `3.5x m//s` then `x` is

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The correct Answer is:
D

`v=3u,v_(x)^(2)+v_(u)^(2)=(3u)^(2),u^(2)+2gh=au^(2)`
`u^(2)=(2gh)/8=49`
`u=7 m//s =3.5 x,x=2`
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