# Units and Vector Directions

In my previous post, I realize that I gave an incorrect answer to the solved problem. Not so much as incorrect, the number sure is right, but it is a vector (has magnitude and direction) and I treated it like a scalar (magnitude only), by leaving out direction. The answer should have been a=2.254 m/s^{2} downwards. Another thing I left out in the original answer was units, something that it is common for me to neglect or often mess up. Any time I am read a word problem for the first time I do what I was taught, take out only the useful information, ie. the numbers. And not uncommonly these numbers are connected to units, which I will inconveniently ignore. And by the time I get to the end of the problem, I will probably have an answer that is off by some power because I have not converted grams to kilograms or something like that. So remember: always use correct units and label directions on vectors!

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