Question

20. For the following distance-time graph which of the following is correct
V
t
(a) speed of A =speed of B
(b) speed of A >speed of B
c) speed of A<speed of B
(d) incomplete information​

Answer 1

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11th

Physics

Motion in a Straight Line

Acceleration

Fig shows the distance - ti...

PHYSICS

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Asked on October 15, 2019 by

Indhu Mathi

Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a) Which of the three is travelling the fastest?

(b) Are all three ever at the same point on the road?

(c) How far has C travelled when B passes A?

(d) How far has B travelled by the time it passes C?

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VIDEO EXPLANATION

ANSWER

(a) The slope of distance-time graph gives the speed of the objects.

As the slope of object (B) is the greatest among all, thus B has the largest speed and hence it is the fastest among all the objects.

(b) : As the curve of the objects do not intersect with each other even once, hence they cannot be at the same point on the road at the same time.

(c) : On the y axis (i.e distance line), 7 small represents 4 km

∴ 1 small line =

7

4

=0.57 km

Position of C at the instant B passes A is 8 km

(d) ; Position of B at the instant it passes C is 2nd small line above 4 km i.e 4+2×0.57=5.14 km

∴ Distance traveled by B =5.14−0=5.14 km