00:01
This ball is a mass of 57 grams is held just above a basketball of mass 590 grams.
00:06
And the fall to the ground, one to find the magnitude down the velocity, which which is the basketball reaches the ground.
00:13
So we're going to have, we can use the conservation of energy and the production energy, mgh, mgh, we call to the kinetic energy as it reaches the ground.
00:24
Half mv squared.
00:26
Mass cancels out.
00:27
G is 9 .8 ,1, times the height, which was 1 ,000.
00:32
1 .2 meters is equal to 1 over 2 times velocity squared so velocity we call to 4 .85 meters per second so that's for a next we're going to use the consumption of momentum to find the heights that the tennis ball rebounds so during collision with the basketball the tennis ball is going to have the same velocity because it came from the same height and the conservation momentum we have the total initial momentum is equal to total final momentum for the total initial momentum, the momentum is predicted of mass and velocity.
01:14
So we have the mass of the tennis ball, which is 57 grams, times the initial velocity of the tennis ball, which is 4 .85 mites a second downwards, plus the mass of the basketball, which is 570 grams times the initial velocity of the basketball, which in this case, it was also going to be 4 .85 mish per second, but it's going to be upwards.
01:45
So during an elastic collision with the ground, the basketball rebounds.
01:51
And because it's an elastic collision, the kinetic energy is conserved...