Need help solving some equation regarding velocity, distance

1. Jan 15, 2016

Kenzo333

1. The problem statement, all variables and given/known data

How to find acceleration and time if the given data is velocity and distance

2. Relevant equations

V = at
S = 1/2at2

3. The attempt at a solution

Sorry if I am in the wrong section, however I really dont know how to find the answer with the equations, please kindly provide me the with the explanation, thank you very much.

2. Jan 15, 2016

WIN

s/v = t and now can find a

3. Jan 15, 2016

J Hann

Don't you also have the equation (derivable from the given equations) : 2 a S = Vf^2 - Vi^2?

4. Jan 15, 2016

haruspex

S=v/t is only valid when there is no acceleration. If there is (constant) acceleration then you need three pieces of information, any three of time, distance, initial velocity, final velocity. If the acceleration is not constant then you need even more.
Please post the whole question, word for word.

5. Jan 18, 2016

WIN

how about just combining the both?
v=at so a=v/t
then substitute it into the second equation. There you will get only 1 unknown in the second equation.