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A ball is thrown from the top of a build...

A ball is thrown from the top of a building with a velocity of 10 m/s and returns with a velocity of 30 m/s to the ground. Find the height of the building.

Text Solution

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`v^2 = u^2 + 2as`
` (30)^2 = (-10)^2 + 2 xx 10 xx s`
`implies 900 = 100 + 20 s `
`implies 800 = 20 s`
` implies s = 40`
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