Question

Displacement - time graph of a body travelling in a straight line is shown in the figure.

Velocity-time graph for the motion of the body will be

• A.
  
• B.
• C.
• D.

Answer 1

The correct option is D

We know that velocity is given by the slope of the displacement - time graph.
From $0$ to $t_1$, velocity is positive and constant as indicated by positive and constant slope.
From $t_1$ to $t_3$, slope is zero, hence velocity is zero.
From $t_3$ to $t_4$, velocity is negative and constant as indicated by negative and constant slope.
Option (d) satisfies all these observations.