Physics dimensions of acceleration question

[ProBasket]

i have a question from mastering physics(online site that i do my homework on) that i don't 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)

 

[vincentchan]

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

 

[ProBasket]

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

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

 

[vincentchan]

what is the demension of v, then

 

[ProBasket]

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

 

[vincentchan]

yup......