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) A car is moving on a straight road and going at 20 mi/h. Then the driver hitsabruptly the breaks and the car undergoes a motion of constant negative accelerationuntil it stops. We ignore any air-resistance and assume that the car slows down in themost efficient possible way. It comes at a full stop after going a distance of 6.0 m.How much time would it take for the car to stop if instead the initial speed was 45 mi/hand driver hit the breaks as abruptly as in the first case?a. 1.5 sb. 3.0 sc. 1.4 sd. 0.85 s

Question

) A car is moving on a straight road and going at 20 mi/h. Then the driver hits
abruptly the breaks and the car undergoes a motion of constant negative acceleration
until it stops. We ignore any air-resistance and assume that the car slows down in the
most efficient possible way. It comes at a full stop after going a distance of 6.0 m.
How much time would it take for the car to stop if instead the initial speed was 45 mi/h
and driver hit the breaks as abruptly as in the first case?
a. 1.5 s
b. 3.0 s
c. 1.4 s
d. 0.85 s

check_circleAnswer
Step 1

Deceleration of the car can be...

-v 2as
a =
2s
020mi/h0.447m/s
mi/h
2(6.0m)
-6.603m/s
|
help_outline

Image Transcriptionclose

-v 2as a = 2s 020mi/h0.447m/s mi/h 2(6.0m) -6.603m/s |

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Physics

Newtons Laws of Motion

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