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A ball of mass 1 kg is projected with 10...

A ball of mass 1 kg is projected with `10ms^(-1)` froom the top of a toer of height 20 m. What is its speed when it is at vertical distance of 10 m below point of projection? `(g=10ms^(-2))`

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Hint : `DeltaK=K_(f)-K_(l)=(1)/(2)mv^(2)-(1)/(2)m u^(2)=W_("gravity force")`
`u=10m//s, v=?`
`m=1kg,`
`h=10m`
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