At what angle with the horizontal should a ball be thrown so that the range R is related to the time of flight as R=5 T2? (Take g= 10 ms-2)

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30o

45o

60o

90o

answer is B.

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Detailed Solution

RT2=gsin2θ4sin2θ=g2cotθ=5cotθ Given RT2=5 Hence, 5=5cotθ or θ=45°

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