Question

A competitive cliff diver jumps into

Answer 1

Answer:

2.25 seconds

Step-by-step explanation

$d=16t^{2}$

$d=81 feet\\t=?$

Because you know what distance equals you can plug it into the equation

$81=16t^{2}$

From there you can solve by dividing the 16 over and then square rooting.

$\frac{81}{16}=t^{2}$

$5.0625=t^{2}$

You take the square-root to get rid of $t^{2}$

$\sqrt{5.0625} =\sqrt{t}^{2}$

$t=2.25$