1. An object is launched from an elevated surface at $67$m/s at an angle of $58\mathrm{.}5°.$ If the object reaches a maximum height of $752$m before hitting the ground, how long was it in the air?

2. A ball is rolled from a flat surface and is in the air for $9\mathrm{.}66$s before hitting the ground $521$m away. What was the initial velocity of the object?

3. An object that is launched from a flat surface is in the air for $5\mathrm{.}23$s before landing $68\mathrm{.}6$m away. If its initial velocity is $28\mathrm{.}8\frac{}{}m/s,$ what was the object's launch angle?