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Q.

The graph shows position as a function of time for two trains running on parallel tracks. Which statement is true?

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a

At time tB, both trains have the same velocity

b

Both trains have the same velocity at some time after tB

c

Both trains have the same velocity at some time before tB

d

Somewhere on the graph, both trains have the same acceleration.

answer is C.

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Detailed Solution

At some time before tB, slope of B will be equal to slope of A.Acceleration of A is zero always whereas that of B is not zero.
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