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[" X.A A stone is dropped from certain h...

[" X.A A stone is dropped from certain height above "],[" the ground.After "5" s a ball passes through a "],[" pane of glass held horizontally and instanta- "],[" neously loses "20%" of its velocity.If the ball "],[" takes "2" more seconds to reach the ground,"],[" the height of the glass above the ground is "]

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