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Question

A stone is dropped from the top of a tower. When it crosses a point 5 m below the top, another stone is let fall from a point 25 m below the top. Both stones reach the bottom of the tower simultaneously. Find the height of the tower. Take g=10m/s2.

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Solution

displacementofthefirststonewhensecondisdropped=5m,thustimedifferenceindroppingofthestonesist=2hg=1sh=12gt2=12g(t1)2+25t=3sthus,h=45m

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