A rock is dropped from a bridge 320 feet above the river. The pathway that the rock takes can be modeled by the equation h= -16t

Question

3 years ago

10

2+320. How long will it take the rock to reach the river?

2 answers:

Masja [62] · Answer 1 · 2022-06-10T12:26:00+03:00

Masja [62]3 years ago

7 0

Answer:

288

Step-by-step explanation:

Zigmanuir [339] · Answer 2 · 2022-06-10T14:13:24+03:00

Answer: 4.47 seconds.

Step-by-step explanation:

Hi, the rock will reach the river when the height (h) is 0.

So, replacing in the equation given:

h= -16t2+320

Where t is the time

0= -16t2+320

Solving for t

-320 = -16t2

-320/-16 =t2

20 = t2

√20 =t

4.47 = t

Assuming that t is the time in seconds, the rock will reach the river after 4.47 seconds.

Feel free to ask for more if needed or if you did not understand something.