00:02
The rock is thrown vertically upwards with a speed of 20 minute per second from the top of a cliff.
00:07
It takes 30 seconds for the rock to hit the ground below.
00:09
How high must the cliff be? so this would be the high to our cliff, aka the displacement.
00:17
This is the initial loss.
00:18
T is called as vn.
00:20
Now, i have the total time of flight, which is 30 seconds.
00:28
We'll set up the exertion to its gravity, which is 9 .8, 1 mitats per second, downward.
00:35
2nd squared.
00:35
So with these four variables, you can use the equation.
00:39
H is equal to u -t, v -0 -t plus half, g2 squared.
00:47
Now, h is our displacement, which is.....