Need find end velocity given accel., time, distance

[LVanderlinden]

urgent! Need find end velocity given accel., time, distance

1.The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows with a constant acceleration -5.90 m/s2 for 4.45 s, making straight skid marks 60.0 m long ending at the tree. With what speed does the car then strike the tree?

The Attempt at a Solution

so I tried to find Vo using Vo=x-at^2/2
and I plugged Vo into Vf=Vi+at and got 13.4 but it was wrong.
Please help me I am so confused.

 

[nasu]

1.The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows with a constant acceleration -5.90 m/s2 for 4.45 s, making straight skid marks 60.0 m long ending at the tree. With what speed does the car then strike the tree?

The Attempt at a Solution

so I tried to find Vo using Vo=x-at^2/2
and I plugged Vo into Vf=Vi+at and got 13.4 but it was wrong.
Please help me I am so confused.

The equation in red is wrong. See again the equation of motion (for position vs time).
The idea of using the two equations to eliminate vo is OK.