Explain how time in the air for a projectile is affected by the angle of release

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Explain how time in the air for a projectile is affected by the angle of release. For equal take off and landing height, what is the optimal angle of release to maximize time in the air?

Also indicate for a release angle of 45 degrees, how time up and time down are or are not affected by when the landing height is above, rather than equal to the take-off height. Ensure you explain your answer.