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Question

Two balls are projected horizontally from the top of the building simultaneously with velocities 15 ms1 and 20 ms1 respectively. The ratio of time taken by them to reach the ground is ___.

A
2:3
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B
3:4
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C
1:1
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D
4:9
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Solution

The correct option is C 1:1
Time of flight is calculated by T=2Hg
where H is the height from which the projectile is thrown horizontally.
So, time of flight is independent of initial horizontal velocity.
Thus time of flight remains the same for both.
T1:T2=1:1

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