SUVAT Question (from ENGAA 2019 Paper)

[TomK]

Homework Statement

ENGAA Question

Relevant Equations

SUVAT equations

The correct answer is 'C'. I don't understand why my working is wrong. What is the optimal way to do a question like this?

 

[gneill]

We can't judge your working if you don't show it. Please detail your attempt at solution.

 

[TomK]

The OP has both pictures.

 

[haruspex]

You seem to have misread the question. The road sign was passed at t=0.

 

[TomK]

Thank you for pointing that out. I did it again and got the right answer.