First slide

Instantaneous acceleration

Question

The displacement of a particle as a function of time is shown in figure. It indicates that

Moderate

A

the velocity of the particle is constant throughout
B

the acceleration of the particle is constant throughout
C

the particle starts with a constant velocity and is accelerated
D

the motion is retarded and finally the particle stops

Solution

At first, the slope is decreasing, therefore the motion is retarded. Finally, the displacement becomes constant, thus the particle stops.

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