00:02
So here, a baseball player hits the ball which weights 145 grams and has the initial speed of 75 meters per second.
00:15
The player hit this ball with a bat which has a mass of 1 kilogram and moving at 63 meters per second in the opposite direction.
00:29
And we have to calculate the speed of the ball after this collision.
00:34
So let's illustrate it.
00:36
Initially we have the baseball moving to the left, three to the right with the momentum of mv 0 and the baseball bat moving to the opposite direction, so to the left with the momentum of m capital times v1.
00:55
Then the baseball after the collision the baseball bat stops, so its momentum is zero.
01:07
And the baseball on the other hand moves to the opposite direction with the momentum of m .u.
01:15
Let's introduce x -axis to the left and let's realize the consideration of the momentum in this system.
01:25
The initial total momentum of the system equals to the final momentum of the system if it's written in the vector form.
01:35
And if we projected on the x -axis, then this equation becomes...