Question

From the displacement – time graph shown given below calculate:

1. Average velocity in the first three seconds.
2. Displacement from the initial position at the end of 13 s.
3. Time after which the body is at the initial position,
4. Average velocity after 8 s.

Answer 1

(i) In first three seconds
Total displacement = 8m
Total time = 3 s
Average velocity = Total displacement/Total time = 8/3
= 2.67 ms⁻¹
(ii) Displacement from the initial position at the end of 13s = −8m.
(iii) Body is at the initial position after 8s and 17s.
(iv) Average velocity after 8s is zero because, after 8s, displacement is zero.