A car travels a certain distance along a straight road (in the +X direction). Th

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 fiqure below. When the car changes speed it does so uniformly. Select the appropriate choice for each statement. 1000 800 600 400 200 20 40 80 Tine (s) Greater than The speed at 7 sec Is..... the speed at 64 sec. The acceleration magnitude at 36 sec is The x-acceleration is zero at 52 sec the acceleration magnitude at 15 sec. aoa At 7 sec, the speed is as high as it gets Equal toThe speed is zero at 23 sec By extrapolating the straight sections of the graph, you can estimate the time during which the s speed, should lét you estimate the magnitudé of the acceleration. Incorrect. Tries 3/10 Previous Trles

Explanation / Answer

slope at point on x vs t curve will give speed at that point.

slope at 7 sec > slope at 64 sec  

Ans: Greater than

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at 36 sec, speed change from 0 to v2.

and at 15 sec, speed change from v1 to 0.

and by observing slopes, v2 > v1.

so a at 36 s > a at 15 sec  

Ans Greater than

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at 52 sec, slope is constant.

so v is constant so a = 0

Ans: equal to

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highest speed( or highest slope) is inbetween 40 to 60s.

Ans: False

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at 58 s, speed (slope) changes so acceleration will be non - zero.

Ans: equal to  

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at 23s, slope = 0

so v = 0

ANS: EQUAL TO

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