If and u are angle of projection and initial velocity of a projectile respectively, the total time of flight, is given by

• A. <img src="/_files/images/civil-engineering/applied-mechanics/110-5.137-1.png">
• B. <img src="/_files/images/civil-engineering/applied-mechanics/110-5.137-2.png">
• C. <img src="/_files/images/civil-engineering/applied-mechanics/110-5.137-3.png">
• D. <img src="/_files/images/civil-engineering/applied-mechanics/110-5.137-4.png">