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Question

The displacement of a particle as a function of time is shown in figure. The figure indicates that
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A
the particle starts with a certain velocity, but the motion is retarded and finally the particle stops.
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B
the velocity of the particle is constant throughout.
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C
the acceleration of the particle is positive throughout.
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D
the particle starts with a constant velocity, the motion is accelerated and finally the particle moves with another constant velocity.
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Solution

The correct option is A the particle starts with a certain velocity, but the motion is retarded and finally the particle stops.
Initially the slope is decreasing and the slope = 0.
Thus velocity is decreasing as time increases, i.e. there is retardation and ultimately the particle stops. It must have obviously started with some velocity.

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