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  4. If for a given angle of projection, the horizontal range is doubled, the time of flight becomes:

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Q. If for a given angle of projection, the horizontal range is doubled, the time of flight becomes:

JIPMERJIPMER 1999

Solution:

Since, time of flight $ T\propto \sqrt{R} $ (where R= horizontal range of flight) when R is doubled the time of flight will become $ \sqrt{2} $ times.