What speed does the truck then strike the tree

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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?

Reference no: EM1344994

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