Question

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

• 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 particle starts from rest and is accelerated throughout
• E. the motion is retarded and finally the particle stops

Answer 1

Answer: (E)

Initially the slope is decreasing and then slope = 0.
$\therefore $ vel. is decreasing i.e. there is retardation and ultimately the particle stops. It must have obviously started with some velocity.