# A Physics Kinematics Question about Acceleration

1. Sep 13, 2009

### xiayu1993

1. The problem statement, all variables and given/known data
This is the v-t(velocity-time) graph of two moving objects,A and B :

Please check whether the following statement is true or false(including wrong description).

At the moment t1, the acceleration of A is BIGGER than that of B.
PS: In this case,"a vector A is bigger than another one B" means ||A||>||B||.

2. Relevant equations

3. The attempt at a solution
I'm a Chinese senior high school student who is not good at English,so please don't mind mistakes of grammar.I am really trying my best to post this thread.:shy::shy:
I think this statement is right,but my teacher said that there's no given exact numbers or function expressions and we can't find the exact relationship between line A and line B,including their point of intersection.
My opinion is that we can find the answer from the graph obviously( considering a very short range covering the point t1, delta(v) of A is obviously bigger than that of B )

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Last edited: Sep 13, 2009
2. Sep 13, 2009

### Hootenanny

Staff Emeritus
Welcome to Physics Forums.

I would agree with your conclusion, the magnitude of the acceleration of A is definitely larger than that of B (at t1).