Calculate distance given acceleration, initial and final speed

[AQuestionX]

dleted due to error

 

[Seannation]

The equation you've used is finding time, not distance.

The equation to use in this case is:

$$v^2 = u^2 + 2as$$

Where v is the final speed, u is the initial speed, a is the acceleration and s is the displacement.

Rearrange this to find s.

Remember that the driver is decelerating, so the acceleration is -2.68 ms^-2.