Given below as Figure 13.8 is the distance-time graph of the motion an object.

(i) What will be the position of the object at the 20s?

(ii) What will be the distance travelled by the object in 12s?

(iii) What is the average speed of the object?

i) So to find position of object at time 20 second, we draw line parallel to y-axis from time 20 and take the point where it intersect then again draw line parallel to x-axis, we get the distance where it intersect the y- axis.

Here position is 8 meter from starting.

ii) Distance travel in 12 second by the object is 6 meter.

iii) Since average speed of object is define as total distance covered by object by total time take. So here total distance is 8 m and total time is 20 second,

Average speed =

= 0.4 m/s