00:01
So we have an apple with a mass of 0 .2 kilograms, and we have a rock with a mass of 1 .5 kilograms.
00:10
How will their momentums compare to each other? well, we need to find, for momentum, we need to find our velocity.
00:22
And one way we can do this is with our potential energy.
00:26
We know we can do this because they do give us a height of 10 meters.
00:32
Potential energy is equal to mgh.
00:34
G, take g as 9 .8, and we have all of our components.
00:39
But we know that at the top to the bottom, we start out with potential energy, and we end up with kinetic.
00:48
Therefore, we know that our potential energy initial is equal to our kinetic energy final.
00:55
So our mgh is equal to 1 half mg or mv squared.
01:05
I'm not going to specify if this is m1 or if this is v2, anything like that.
01:11
I'm just doing a general case to solve for both.
01:16
So we want to isolate our v.
01:19
Go ahead and multiply both sides by two and also divide by m on both sides.
01:26
1 half and 2 will cancel each other out.
01:28
M and m will cancel each other out.
01:30
And this sim will also cancel itself out with this one.
01:33
So we have v squared is equal to 2gh...