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The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with an acceleration of -5.60 m/s^2 for 4.20 s, making mark straight skid marks of 62.4 m long ending at the tree. With what speed does the car then strike the tree?

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  1. average speed = 62.4 m / 4.20 s = (initial + final) / 2

    change in speed = -5.60 m/s^2 * 4.20 s = initial - final

    solve the system for final

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    posted by R_scott

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