The speed at 10 sec is ...(true/false/greater than/Less than/equal to)..... the

Question

The speed at 10 sec is ...(true/false/greater than/Less than/equal to)..... the speed at 79 sec.

The x-acceleration is ...(true/false/greater than/Less than/equal to)..... zero at 15 sec.

The speed is ...(true/false/greater than/Less than/equal to)..... zero at 20 sec.

The x-acceleration is ...(true/false/greater than/Less than/equal to)..... zero at 4 sec .

At 46 sec, the speed is as high as it gets. The acceleration magnitude at 15 sec is ...(true/false/greater than/Less than/equal to)..... the acceleration magnitude at 38 sec.

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 below. When the car changes speed it does so uniformly. Select the appropriate choice for each statement. 1000 E 800 600 400 200 40 60 20 80 Time (s)

Explanation / Answer

(1) less than ( because at 79 sec slope is less)

(2) less than ( accleration is negative)

(3) less than

(4) equal to (because v is constant)

(5) true

less than (at 15s curvature is less than vurvature at 38s)

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