Question

5. In which section/s is the object

not moving?

6. In which section/s is the object

accelerating?

7. Describe the motion of the object at

section f-g?

8. What is the velocity of the object at:

a – b

c – d

e – f

9. Describe the motion of the object at sections d to f?

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Answer 1

Answer:

In graph A.,B, the time is in decreasing direction and since time is always increasing and is positive hence it is incorrect.

in graph C the object is moving with infinite displacement at same time,also implies that velocity of object is infinite which is not possible for motion of body hence this is also impossible.

in graph D we have a object moving with a constant velocity then with non linear decreasing velocity which is possible for motion of object hence it is possible

Answer 2

Explanation:

5. The graph between the points e and f is constant, so here the object is not moving.

6. The graph between the points b and c is curved, shows that there is change in velocity, and the slope is increasing therefore in this region there is acceleration.

7. The region between f and g, there is a negative slope and it is a straight line, which indicates negative velocity.

8. Between a - b and e - f,  the graph is horizontal means there is no change in the displacement, the object is at rest and hence zero velocity.

    Between c and d, the graph is a straight line, so the object is moving with uniform velocity $\approx\frac{100-75}{37.5-30} =\frac{25}{7.5} =3.3\frac{m}{s}$

9. Between d to e, there is decreasing slope means decreasing velocity, so in this region there is deceleration.

    From e to f, the displacement vs time graph is horizontal means the     velocity is zero.