Why do you divide by 3m it's because you wanted to cancel so that you remain with velocity of the truck car system which is equals two obviously m cancels m then you remain with 20 divided by three. Okay so this is where you pull out your calculator and say negative 20 divided by 3 and you get negative 6.666. So this is what I'm getting as negative 6.6 then I can just round it to two decimal places. And the answer is in meters per second okay remember guys 6.66 is the magnitude okay.
That negative it tells us more about the sign so let's say velocity of the truck car system is equals to we know the speed is 6.67 at 6.67 meters per second in terms of the direction ladies and gentlemen. We assumed positive to be moving to the right negative to the left so because our answer was a negative sign then it means you know it's moving westwards.
Okay or to the left, very much important ladies and gentlemen very much important that you score this easy marks okay. So I hope you understood that part ladies and gentlemen. So obviously we give you a mark for writing the correct formula guys. Okay very much important so now I think you deserve a mark ladies and gentlemen for correct substitution.
I think for correct substitution we can just you know give you some marks remember guys this question is allocated six marks okay. It's allocated six marks so ladies and gentlemen this is you following mathematical procedure okay so we just give you a mark for your final answer and again we give you a mark for indicating the direction. So ladies and gentlemen I hope you fully understand what I've done over there okay. So now we can move to the next question remember that, a day without learning something new it's a day wasted okay.
No comments:
Post a Comment