We're given a statement which reads as follows, so the diagram below shows a car of mass m traveling at a velocity of 20 meters per second east on a straight level road and a truck of mass 2m traveling at 20 meters per second west on the same road. Ignore the effects of friction, so ladies and gentlemen from the given statement you just need to notice that you've got a car and a truck.
It's very much important, listen so this, is a car and this is a track so that means when you continue with your calculations bare in mind that they refer to this as a car and they refer to this as a truck. So in which direction is the car moving in which direction is the truck moving ladies and gentlemen at all times to the east is towards your right hand side to the west is towards your left hand side.
It's in most cases where we refer to the east or towards the east as a positive direction and towards the left as a negative direction. It's normally based on the fact that when you draw a Cartesian plane you've got your x-axis on this side being the positive side and on this side being the negative side.
Also, in terms of objects moving up and down we know up it's mostly taken as positive and down as negative. Reason being on this side of the Cartesian plane of course you've got positive sign, positive sign towards the right, a negative sign towards the left, negative sign downwards or southwards obviously this will mean a northwards or upwards. Very much important ladies and gentlemen so let's now continue with our discussion focusing on the given diagrams. Most importantly guys, obviously these are moving objects.
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