What is time of flight of a projectile ?

In oblique projection time of flight of a projectile is

If the time of flight of a projectile is doubled, what happens to the maximum height at tained?

Neglecting the air resistance , the time of flight of a projectile is determined by :

Neglecting the air resistance, the time of flight of a projectile is determined by

Neglecting the air resistance, the time of flight of a projectile is determined by

The time of flight of a projectile on an upwardd inctined plane depends upon

The time of flight of a projectile is 10 s and range is 500m. Maximum height attained by it is [ g=10 m//s^(2) ]