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A ball, when released from the top of a multistoried building reaches the bottom in 2s. Find the height of the building. Calculate the velocity of the ball when it reaches the earth. `(g= 9.8 ms^(-2))`

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The correct Answer is:
19.6m, `19.6ms^(-1)`
Find .h. using the formula `h=1/2gt^2`. Then put u =0 in the formula v=u+at or `v^2-u^2=2gh` and find v.
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