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Q. The driver of a truck slams on the brakes when he sees a tree blocking the road .the truck slows uniformly with acceleration -5.6 m/s2 for 4.2 s, making skid marks 62.40 m long that end at the tree. With what speed does the truck then strike the tree?

Q. A spring with spring constant k = 210N/m is at first compressed x = 1.90 cm. It is now allowed to relax back to its equilibrium length and then it is stretched an additional 2.30 cm. How much work is completed by the spring during this process?

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