Question

The above graph shows velocity as a function of time for an object moving along as straight line. During which time(s) is the object at rest?
I. $0.5$ seconds
II. From $1$ to $2$ seconds
III. $2.5$ seconds

• A. I only
• B. II only
• C. III only
• D. I and III only

Answer 1

The correct option is D I and III only

In velocity-time graph, the velocity of an object is zero at the instant the curve intersects the time axis.

From graph, the curve intersects the time axis at the instants $t=0.5$ s and $t=2.5$ s.

Thus the object is at rest (or velocity of the object is zero) at $t=0.5$ s and $t=2.5$ s.

Hence option D is correct.