In coming to a stop a car leaves skid marks 77m long on the, Ask an Expert

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Q. A 15 kg box slides d = 4m down the frictionless ramp, afterwards collides with a spring whose spring constant is 160N/m. The angle of the ramp is 30 degrees. What is the maximal compression of spring?

Q. In coming to a stop, a car leaves skid marks 77m long on the highway. Assuming a deceleration of 8m/s2, estimate the speed of the car just before braking.

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