# Physics dimensions of acceleration question

1. Jan 23, 2005

i have a question from mastering physics(online site that i do my hw on) that i dont get.

Question: Find the dimensions [a] of acceleration.

Express your answer as powers of length (l), mass (m), and time (t).

and here's a small hint they give you for the equation for acceleration:

In physics, acceleration a is defined as the change in velocity in a certain time. This is shown by the $$a = \triangle v/\triangle t$$.. The $$\triangle$$ is a symbol that means "the change in."

[a] = _______ (answer can only be expressed in l,m and/or t)

2. Jan 23, 2005

### vincentchan

the change in v has same demension of v.... same rule applied to t,too

3. Jan 24, 2005

yea, but the answer can only be in length (l), mass (m), and time (t).

4. Jan 24, 2005

### vincentchan

what is the demension of v, then

5. Jan 24, 2005

got the answer, it's $$LT^{-2}$$