Answers: 1) The direction of the velocity at any point in time will be to the right (positive) in the x-direction. I.E. The x component of the velocity should be a positive constant value at any point in time. Also, the y component of the velocity vector will always be affected by the constant negative acceleration of gravity. The direction of the acceleration will always be negative (down) and constant due to gravity.
2) Yes. The complementary angle of 60 degrees.
3) No. Without calculation, it would not be possible to determine the launch angle. It can only be estimated to be less than 75 degrees and more than 60 degrees.
Section:
Answers: 1) There is no definite direction of the velocity at any point in time as it is in flight; the only certainty is that the x component is constant to the right and that the y component is changing as it is affected by the constant negative (downward) acceleration of gravity.
Answers:1) If a projectile's vertical velocity is upward at first, the velocity will get less and less positive and will eventually become negative before the projectile hits the ground. If the projectile's vertical velocity is 0 or downward at first, then the projectile's velocity will always be negative after it's released. The direction of the acceleration is always downward. 2) Yes, 60 degrees. 3) No, that freakin' block is in the way! The ground isn't level! Even a 60 degree angle here will cause the bullet to overshoot its target on the block.