Help in Projectiles

[Born Science]

Hello, I am a new member here... I need help in solving a huge homework, there are 4 exercises, each exercise contain many problem solving that I need to solve, I don't really know some of my answers are true or not, I need someone who is professional in Applied Math to help solve the problem before the exam starts (13/3/2012) and thanks

[Shadow]

There's a homework section for that