00:01
So we're first going to say that the positive direction, or that's to say, positive direction, would be in the direction of final velocity, or in this case, it would be towards the pitcher.
00:19
So based on this, we can say that for part a, for part a, to find i, the impulse, this would be equalling delta p.
00:28
This would be equalling the mass times the delta v or the change in the velocity, or we can say the mass times velocity final minus velocity initial, or the mass multiplied by the difference between the final and initial velocities.
00:42
And so this is equaling 0 .48 kilograms multiplied by 48 meters per second minus negative 42 meters per second.
00:57
And so this is going to be, the impulse i is going to be equaling approximately 13 kilograms meters per second.
01:07
Or we can simply say 13 newton seconds.
01:12
Also, the unit of measurement for impulse.
01:14
Now, we know that for part b to find the average force, this would be equalling the impulse divided by delta t.
01:24
So the change in the momentum over a time interval would give us the average force during that time interval.
01:30
And so this would be positive 13 newton seconds.
01:34
Dividing by seconds would simply give us neutens, which is essentially what we want...