Q1 a certain elevator cab has a total run of 171 m and a, Ask an Expert

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Q1. A certain elevator cab has a total run of 171 m and a greatest speed is 4.75 m/sec, and it accelerates from rest and then back to rest at 1.21 m/s2. How long does it take to make the nonstop 171 m run, starting and ending at rest?

Q2. The car's motion can be divided into three different stages: its motion before the driver realizes he's late, its motion after the driver hits the gas (but before he sees the police car), and its motion after the driver sees the police car. Which of the following simplifying assumptions is it reasonable to make in this problem?

Throughout each of the three different stages of its motion, the car is moving with constant acceleration.

Throughout each of the three different stages of its motion, the car is moving with constant velocity.

The highway is straight (such as there are no curves).

The highway is level (as in there are no hills or valleys).

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