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Question

A ball is projected at an angle of 30o and 60o to the horizontal with the same initial velocity in each case. Ratio of their time of flight is

A
1:1
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B
1:3
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C
1:3
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D
2:3
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Solution

The correct option is C 1:3
time of flight T=2v0sinθg
T1T2=2v0sin30g×g2v0sin60
T1T2=sin30sin60=1232=13

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