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A projectile thrown with velocity v maki...

A projectile thrown with velocity v making angle `theta` with vertical gains maximum height H in the time for which the projectile remains in air, the time period is

A

`sqrt(Hcostheta//g)`

B

`sqrt(2Hcostheta//g)`

C

`sqrt(4H//g)`

D

`sqrt(8H//g)`

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