Time of flight of a projectile on a horizontal plane, is

• A. <img src="/_files/images/civil-engineering/applied-mechanics/106-5.81-1.png">
• B. <img src="/_files/images/civil-engineering/applied-mechanics/106-5.81-2.png">
• C. <img src="/_files/images/civil-engineering/applied-mechanics/106-5.81-3.png">
• D. <img src="/_files/images/civil-engineering/applied-mechanics/106-5.81-4.png">