00:01
All right, so number one, let's say we have a car with a mass of 800 kilograms, and it's subjected to, or sorry, it has a momentum p of 12 ,000 kilograms times a meter per second, when it has a negative impulse imparted to it of, let's see, so we'll write this is 10 to the fourth kilograms times a meter per second over an interval of two seconds.
00:30
We want to know what's the acceleration of the car.
00:32
So the acceleration is basically going to be like the change in the velocity, which you can write as delta p over m divided by the time interval.
00:40
So if you do that, 10 to the 4th, divided by 2, divided by 800.
00:45
This will be negative 6 .25 meters per second squared.
00:53
And then question 2, we have what is the net force acting on the car? so this is just going to be m times a, where we have all the same numbers.
01:08
And so this would just be 5 ,000 newtons or negative because it's going backwards.
01:15
Question three asks, we have a 4 kilogram ball moving at 20 meters a second...