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 statement. 1000 E 800 600 400 200 20 60 80 Time (s) Greater thanThe speed is zero at 26 sec The acceleration magnitude at 38 sec is. the acceleration magnitude at 15 sec. At 73 sec, the speed is as high as it gets The speed at 10 sec is..... the speed at 73 sec True True True True 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 the magnitude of the acceleration Submit Answer Incorrect. Tries 1/10 Previous Tries Using the graph above, calculate the average speed of the car for the period from 0 to 20.0 s Submit Answer Tries 0/10

Explanation / Answer

here,

a)

at t = 26 s

the slope of the curve is zero

so the speed is equal to zero

b)

True ,

as at t = 15 s

the car is moving at constant speed

so, the accelration is zero

c)

the accelration at 38 s is positive

the accelration magnitude at 38 s is greater than the accelration at 15 s

d)

False

at t = 73 s

the speed is lower than that of t = 15 s

e)

the speed at t= 10 s is greater than the speed at t = 73 s

f)

TRUE

the accelration is zero at t = 52 s as it is moving at constant speed

e)

for t = 20 s

average speed , v = ( distance travelled)/time taken

v = ( 300 /20) = 15 s

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