Physics Question 5

A ball is projected in an angle of 30 degrees from the horizontal in a velocity of 320ms-1 upward.
Find,

1. The time taken for it to come to the maximum height,
2. The horizontal range that takes to come to the maximum height,
3. The maximum horizontal range that can be achieved with this velocity(The projectile angle is unknown),
4. To achieve this horizontal range, what is the angle the ball has to be projected.