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 figure below. When the car changes speed it does so uniformly. Select the appropriate choice for each státement. 1000 E 800 600 43 400 200 20 40 60 80 Time (s) Greater than The x-acceleration is zero at 37 sec. Less than The acceleration magnitude at 15 sec is..... the acceleration magnitude at 37 sec: Equal toThe speed is... zero at 20 sec. Greater thanThe speed at 73 sec is the speed at 46 sec. True as it gets Less than 52 sec By extrapolating the straight sections of the graph, you can estimate the time during which the speed is changing. This, with the change in speed, should let you estimate At 46 sec, the speed is as high The x-acceleration is zero at the magnitude of the acceleration. Enviar Respuesta Incorrecto. Tries 3/12 Using the graph above, calculate the average speed of the car for the period from 0 to 10.0 s Enviar Respuesta Tries 0/12

Explanation / Answer

1) GREATER THAN

Since the slope is increasing.

2) GREATER THAN

At 15 seconds, the car is decelerating with magnitude LARGER than its acceleration at 37 sec as can be seen because the curve changes more sharply (higher curvature) at 15 seconds than at 37 seconds.

3) EQUAL TO

The slope of x ( t ) is zero, thus the speed is ZERO at 20 seconds.

4) GREATER THAN

Slope is more

5) TRUE

Since it is the steepest slope.

6) EQUAL TO

since the slope of the curve x ( t ) is constant around 52 seconds, the velocity is constant and thus acceleration vanishes at that time.

Avg speed = total speed/total time

= 1200/80

= 15 m/s

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