Question

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

• A. the particle starts with a certain velocity, but the motion is retarded and finally the particle stops.
• B. the velocity of the particle is constant throughout.
• C. the acceleration of the particle is positive throughout.
• D. the particle starts with a constant velocity, the motion is accelerated and finally the particle moves with another constant velocity.

Answer 1

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.