The speed at 52 sec is (true, false, equal, greater, less) the speed at 64 sec.

Question

The speed at 52 sec is (true, false, equal, greater, less) the speed at 64 sec.
The speed is (true, false, equal, greater, less) zero at 29 sec.
The acceleration magnitude at 15 sec is (true, false, equal, greater, less) the acceleration magnitude at 37 sec.
At 4 sec, the speed is as high as it gets.(true, false, equal, greater, less) The x-acceleration is (true, false, equal, greater, less) zero at 50 sec .
The x-acceleration is (true, false, equal, greater, less) zero at 37 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 the magnitude of the acceleration. Using the graph above, calculate the average speed of the car for the period from 0 to 60.0 s The speed at 52 sec is (true, false, equal, greater, less) the speed at 64 sec.
The speed is (true, false, equal, greater, less) zero at 29 sec.
The acceleration magnitude at 15 sec is (true, false, equal, greater, less) the acceleration magnitude at 37 sec.
At 4 sec, the speed is as high as it gets.(true, false, equal, greater, less) The x-acceleration is (true, false, equal, greater, less) zero at 50 sec .
The x-acceleration is (true, false, equal, greater, less) zero at 37 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 the magnitude of the acceleration. Using the graph above, calculate the average speed of the car for the period from 0 to 60.0 s A car travels a certain distance along a straight road in the +x direction). The distance the car travels as a unction of time is shown in the figure below. When the car changes speed it does so uniformly. Select the appropriate choic for each statement. 1000 800 600 43 400 200 0 20 40 60 80

Explanation / Answer

By cheggs policy, we can answer only 4 subparts, however, I am answering 6 subparts of the question.

a)The speed of the particle is nothing but the slope of the line at the given time.So, the speed of the body at any given time t is the slope of the graph at that time t.

so slope at 52 seconds is greater than that at 64 seconds. Hence speed is greater at 52 seconds than 64 seconds.

b)since the slope of the line is 0 at 29seconds, the speed is 0.

c)at t=15 seconds, the speed of the particle decreases, but the slope is less than at 37 seconds. hence it is lower at t=15 seconds.

d)No, the slope of the curve is the highest between 40 seconds and 60 seconds, Hence the speed is the highest between 40 and 60 seconds.

e)at t=50 seconds, the speed of the car is constant and it remains the same till 60 seconds. hence the acceleration is 0.

f)at time t=37 seconds, the speed is 0 however, there is a sharp curve at t=37 seconds as a result of which the speed of the car increases. Hence, the acceleration is positive.

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