Problem 2.55 The figure shows the velocity of a train as a function of time. (Fi

Question

Problem 2.55

The figure shows the velocity of a train as a function of time.
(Figure 1)

Part A

At what time was its velocity greatest?

Express your answer as an integer.

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Part B

During what periods, if any, was the velocity constant?

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Part C

During what periods, if any, was the acceleration constant?

Check all that apply.

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Part D

When was the magnitude of the acceleration greatest?

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Problem 2.55

The figure shows the velocity of a train as a function of time.
(Figure 1)

Part A

At what time was its velocity greatest?

Express your answer as an integer.

tv=max =   s  

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Part B

During what periods, if any, was the velocity constant?

During what periods, if any, was the velocity constant? from t = 90 s to t 108 s from t 65 s to t 83 s from t = 42 s to t 65 s from t = 110 s to t 125 s from t = 0 s to t 42 s

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Part C

During what periods, if any, was the acceleration constant?

Check all that apply.

Check all that apply. from t = 0 s to t 42 s from t = 90 s to t 108 s from t = 110 s to t 125 s from t 65 s to t 83 s from t = 42 s to t 65 s

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Part D

When was the magnitude of the acceleration greatest?

When was the magnitude of the acceleration greatest? from t = 42 s to t 65 s from t = 90 s to t 108 s from t = 0 s to t 42 s from t = 110 s to t 125 s from t 65 s to t 83 s

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20 10 0 10 20 30 40 50 60 70 80 90 100 110 120 t (s)

Explanation / Answer

paRT A

the velocity is maximum at t = 50 s

PArtB

velocity is constant during t=90s to t=108 s

Part C

  
acceleration is constant during t= 0s to t= 42 s and t = 65 s to t = 83 s

Part D

magnitude of the acceleration is greatest during t = 42 s to t = 65 s, slope is more than other times

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