A stone is dropped from a height of 90cm above the top of a window which is 160 cm high. The time taken by the stone to cross the window is

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1/7 s

2/7 s

3/7 s

4/7 s

answer is B.

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Detailed Solution

t1 = to come upto the window =2×90980=37sec.t2 = to come below the window =2×250980=57sect2−t1=27 sec. time to cross the window.

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