AS Physics Q (Easy but want to clarify)

1. Sep 29, 2004

iNsChris

IGNORE THIS - CANT DELETE HAVE NOW REALISED MY ERROR SORRY

Just wondering if i am either:

Being Illogical
Book has a typo
Or simply rearranging equation to suit the question.

here is the question...

A Car acclerates from 5 m s -1 to 15 m s-1 in 6 seconds.

Find the acceleration.

Chosen formula:

V = U + AT
So i thougth ok... replace letters with numbers (logical)

5 = 15 = (ax6)
So then i think hmmm thats not right... wont get me an answer and if it did it would be totally wrong!

So i checked textbook and see:

15 = 5 + (ax6)
a = 1.67

Now... This is actualy u = v+ AT

So... it makes sense sure... But they have changed the equation a bit.

i want to know something...
Is it a typo in the textbook (No... it gets the correct answer).
Is it simply changing the equation to suite the question therefore getting us a answer...

And if so - Where can i find out all this "rearranging" equations stuff.

Im a distance learner, I may phone my tutor but i thought i would put it here first.

Thanks,

Last edited: Sep 29, 2004