Question

The displacement against time graph for an object is shown below.

A.Describe the motion of the object.

B. For the object, calculate:

i.its velocity at 2.0 s

ii.its average velocity for a period of 12 s.

Answer 1

A. The motion is accelerated.

B. Its velocity at 20 s is

$$v=at=2·20=40\text{ m/s}.$$

The average velocity:

$$v_{av}=\frac{at}{2}=\frac{2·12}{2}=12\text{ m/s}.$$