00:01
Consider a 200 gram ball drop from a height of 2 meters.
00:04
It bounces on a hard floor and rebounds to 1 .5 meters.
00:08
And we're asked, what is the maximum force the floor exerts on the ball? okay, so first we're going to find their velocities.
00:17
Our initial velocity and our final velocity, and they will equal both square root of 2gs, which will be equal to the square root of 2 times 9 .81 meters per second squared.
00:38
Times 2 meters, 2 .0, and 2 times 9 .81 meters per second squared times 1 .5 meters.
01:00
And these will equal, respectively, negative 6 .26 meters, because this is down, and 5 .42, that's meters per second, my bad meters per second, because that's upward.
01:21
And then we know that, and this will equal 0 .20.
01:35
Let me look again here.
01:39
0 .20 kilograms...