Physics

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When James applied the brakes to his car, it slows unifromly from 15.0 m/s to 0.0 m/s in 2.50 s. How many meters before a stop sign must she apply her brakes in order to stop at the sign?

Answers:
6.0m
37.5 m
18.8 m
48.0m

Please help-I've just started Physics last week and I'm already screwed up with which formular to use-Could you please explain?
Thank you

  • Physics -

    2) second grade formula:
    distance= averageveloicty*time
    = (1/2)(15+0)*2.5

    3) hard way:
    Vf^2=Vi^2+2ad
    where a is changevelocity/time=(0-15)/2.; and notice a is negative.
    and solve for d.

    4) still harder: compute a as above.
    distance=Vi*t+1/2 a t^2

  • Physics -

    Thank you-I appreciate it

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