Question

The average height of an apple tree is 4.00 meters. How long would it take an apple falling from that height to reach the ground?
Given: g = -9.8 meters/second^2
-0.82 Seconds
-1.0 Seconds
-1.53 Seconds
-2.3 Seconds

Answer 1

Hi! You need an equation for this, do you agree? It has to have distance and acceleration! Any ideas?

Answer 2

Yes. I have none at all lol

Answer 3

\(d=v_it+\frac{1}{2}a\ t^2\) should suffice!

Answer 4

Wait...

Answer 5

What? lol
And what does the varables symbolize in the equation? Well, I know V, but what's D, A, and T?

Answer 6

Well, \(v_i=0\)

Answer 7

\(d\) is the distance, or the height
\(a\) is the acceleration. Here, it's the acceleration due to gravity, which is usually \(9.8\), \(9.81\), or \(10\ m/s^2\) depending on your teacher.
\(t\) is the time, how long it will take the apple to fall.

Answer 8

The equations is now \(d=\frac{1}{2}a\ t^2\).

Answer 9

The whole thing is\[x_f=x_i+v_i\ t+\frac{1}{2}a\ t^2\]

The "\(_i\)" indicates "initial," and the "\(_f\)" indicates "final." They're initial and final properties across the interval. Here, the interval is the apple being on the tree to where the apple hits the ground.

Answer 10

And \(a\) for you is \(-9.8\ [m/s^2]\).

Answer 11

So you've found the answer? :) Or do you have any questions?

Answer 12

I don't see a choice for the answer I got.

Answer 13

Actually, to be honest, I guessed and got it wrong :/ I'm only taking physics (trying to get at least a B) to get by and graduate with honors. But thanks anyways! For some reason, I'm just not understanding some criteria in Physics as greatly as I wish I could, especially since I'm self-teaching myself online -_- Again, thanks, theEric!

Answer 14

Lol I get frustrated easily with things like this.

Answer 15

Oh gosh! Self teaching! Good luck! Did it give you the correct answer?

Answer 16

I got\[\sqrt{\frac{(2)(-4\ [m])}{-9.8\ [m/s^2]}}\]

Answer 17

\(\approx 0.903508\ [s]\)

Answer 18

Thank you! :)
I randomly clicked 0.82 and got it right.

Answer 19

Haha, nice! And I hope OpenStudy can help you out in the future :)

Answer 20

Take care!

Answer 21

Thank you very much! You take care too :] Thanks for your time and effort.

Answer 22

My pleasure, thanks.