Assuming positive as right and negative as left


But for those ones who are still in grade 10 and 11 they will be able to go through my lesson where I teach in full in terms of different cases that you might have as far as momentum is consent. Because you can have different situation where they collide and separate in this case they collide and unite in some other cases you've got a bullet which passes through a blog where the bullet now moves as it is at a certain a velocity. 

You also have the block moving at a certain velocity and these questions may extend to such an extent where you still need to calculate the impulse and whatever. Okay so ladies and gentlemen what we do now is just to substitute okay, let's now substitute, what is the mass of the truck? Not the truck but the car, let's start with the car obviously we know ladies and gentlemen it's okay this is the mass of the car multiplied by ladies very much important multiplied by you know the velocity of the car which is 20 meters per second. 

Take into consideration that we are saying positive to the right negative to the left okay. So that's why it's just 20 there but in your mind you know it's actually a positive 20 meters per second okay. Plus ladies and gentlemen, what is the mass of the truck? We know is 2 m okay ladies and gentlemen what is the velocity of the truck?


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