Error ... lesson in physics 1 lab

Here's a (slightly simplified) explanation/example.

Does that help any?

ok verry nice I understood the example .. but here I want to ask about the answer in the red square is it correct ... 

alan I'm waiting you !!! 

Yes it's correct, but notice that it is inside the square brackets, outside of which is the t⁶ factor that divides it.

What is this  "alan I'm waiting you !!! "  3x15.

Do you know how rude that sounds!    You mind your manners!!

Alan is answering your questions out of the kindness of his heart.  

You should be excessively polite NOT rude to him!

very nice alan =D I undrstood that 

!!!!! thank you melody !!! 

That's ok, I am sure that you didn't mean to be rude.

You just have to be careful when you are communicating with just print.  People can't see your body language or your facial expressions so it is easy for them to misinterprete your intent.  

but your comment is very harsh 

Yes sorry, sometimes I get carried away.

Like I said, when it is just in print it is hard to pitch it correctly.