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Mar 21, 2010 #2 Seannation 24 0 The equation you've used is finding time, not distance. The equation to use in this case is: [tex]v^2 = u^2 + 2as[/tex] 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.
The equation you've used is finding time, not distance. The equation to use in this case is: [tex]v^2 = u^2 + 2as[/tex] 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.