Hi, I need some assistance completing the following questions:
A car starting from rest moves with a constant acceleration of 2 m/s^2 for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of -2 m/s^2. How far does it travel?
a. 400 m
b. 100 m
c. 500 m
d. 300 m
e. 200 m
A car with good tires on a dry road can accelerate at about -4.5 m/s^2 when braking. If the car is traveling at 22.0 m/s when the brakes are applied, how far does the car travel before it slows to 10 m/s?
a. 85.3 m
b. 66.7 m
c. 53.8 m
d. 42.7 m
Please refer to the attachment.
For the first question, the answer is A.
How to get this answer?
We consider three time intervals
In this interval, a car ...
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