Question

From the given displacement-time graph, answer the following questions:

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Answer

From the given displacement-time graph, answer the following questions:

q2 mcq motion one dimension concise physics solutions icse class 9 519x481 1
(i) The kind of motion depicted in this graph is :
  1. uniform
  2. non-uniform
  3. retardation
  4. all of the above

(ii) The velocity between points A and C is:

  1. 20 ms-1
  2. 5 ms-1
  3. 10 ms-1
  4. 15 ms-1

(iii) The displacement at t = 3s is:

  1. 15 m/s2
  2. 12.5 m/s2
  3. 40 m
  4. 30 m

(i) uniform

Reason — As the graph shows the linear relationship between displacement and time i.e., the car travels an equal distance in equal intervals of time in a certain direction. Thus, it is moving with uniform motion.

(ii) 10 ms-1

Reason — As, velocity is the ratio of displacement and time, therefore,

Velocity = Slope of straight line AC

= 60-30\over 5-2

= 30\over 3

= 10 m s-1

(iii) 40 m

Reason — When we observe the graph, we notice that at t = 3 s, the displacement axis shows 40 m, hence, displacement at t = 3 s is 40 m

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