Question

a rock breaks loose from a cliff and plunges toward the ground 400 feet below. The distance "d" that the rock falls in "t" seconds is given by the equation d=16t^2. how long does it take the rock to hit the ground??

Answer 1

everybody helppin each other but knowbody want to help me whats up with that

Answer 2

the distance the rock has to travel to hit the ground is 400ft.

400 = 16 * t^2
divide both sides by 16 and take the square root.

Answer 3

25=t^2

Answer 4

5=t

Answer 5

Yup. Don't forget your units!

Answer 6

5 seconds

Answer 7

yep!