Estimate the speed of the car just before braking. how much, Ask an Expert

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Q. In coming to a stop, a car leaves skid marks 87.0 m long on the highway. Assuming a deceleration of 6.90 m/s2, estimate the speed of the car just before braking.

Q. A brick is thrown vertically upward with an initial speed of 3.10 m/s from the roof of a building. If the building is 74.0 m tall, how much time passes before the brick lands on the ground?

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