A tennis ball rolls off the edge of a table. Its speed just before leaving the table was $2\mathrm{.}86\frac{m}{s}.$

$($a$)$ If the height of the table is $79\mathrm{.}0cm,$ how much time has passed before the ball hits the ground?

$t=,s$

$($b$)$ How far from the edge of the table does the ball land?

$x=$

$m$

$($c$)$ A second tennis ball is dropped at the same time from the same height. How long does it take to hit the ground?

$t=$

$s$