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A block of ice starts sliding down from ...

A block of ice starts sliding down from the top of the inclined roof of a house (angle of inclination of roof=`30^(@)` with the horizontal) along aline of maximum slope. The highest and lowest points of the roof are at heights of 8.1m and 5.6 m respectively from the ground. At what horizontal distance from the starting point will the block hit the ground? Neglect friction.

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