A car travels a certain distance along a straight road (in the +x direction). Th
ID: 2130554 • Letter: A
Question
A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure above. When the car changes speed it does so uniformly. Select the appropriate choice for each statement.
The speed is ..... zero at 26 sec.
The acceleration magnitude at 15 sec is ..... the acceleration magnitude at 38 sec.
The x-acceleration is ..... zero at 67 sec .
At 67 sec, the speed is as high as it gets.
The x-acceleration is ..... zero at 15 sec.
The speed at 48 sec is ..... the speed at 67 sec.
the answers are true, false, greater than, equal too, less than.
Explanation / Answer
a) The speed is equal to zero at 26 sec.
b) The acceleration magnitude at 15 sec is less than the acceleration magnitude at 38 sec.
c) The x-acceleration is equal to zero at 67 sec .
d) At 67 sec, the speed is as high as it gets. False
e) The x-acceleration is equal to zero at 15 sec.
f) The speed at 48 sec is greater than the speed at 67 sec.
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