Question

An automobile is traveling on a long, straight highway at a steady 77.0 mi/h when the driver sees a wreck 200 m ahead. At that instant, she applies the brakes (ignore reaction time). Between her and the wreck are two different surfaces. First there is 100 m of ice, where the deceleration is only 1.30 m/s2 . From then on, it is dry concrete, where the deceleration is a more normal 7.60 m/s2

Part A.

What was the car’s speed just after leaving the icy portion of the road?

Part B.

What is the total distance her car travels before it comes to a stop?

Part C.

What is the total time it took the car to stop?

Answer #1

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