Question

The above graph shows position as a function of time for an object moving along a 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 B II only

Slope of the curve under position-time graph gives the instantaneous velocity of the object.

Slope of the curve is zero only in the time interval $1<t<2$ s.

Thus the object is at rest (or velocity is zero) only from $1$ to $2$ s.

Hence option B is correct.