1. 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?

2. 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?