What happens to the time of flight if the launch angle of a projectile is increased from 30 degrees to 45 degrees?

Increases. When the launch angle of a projectile is increased from 30 degrees to 45 degrees, the time of flight increases. The time of flight refers to the total time the object remains in the air before returning to the same height from which it was launched. A greater launch angle results in a larger vertical component of initial velocity, causing the object to reach a higher maximum height. This increased height leads to a longer time for the object to ascend, as well as a longer time to descend back to its initial height. In the case of a 45-degree launch angle, the time of flight is at its maximum for any given initial velocity, as this angle optimizes the balance between the horizontal and vertical components of the initial velocity, leading to the greatest time spent in the air.