Exam
nid2
Word count: 5
2p
2.
The graph represents the motion of a train travelling between two stations.
20
speed
m/s
10-
0
0 100 200 300 400 500 600 700 800 900
timels
a) Describe the motion of the train.[2]
b) Calculate
i. total distance covered during the whole motion.[2]
ii. average velocity during the whole motion. [1]
iii. Retardation of the train.[2]
Answers
Answer:
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Class 11
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>>Motion in a Straight Line
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The graph represents the motion of a train travelling between two stations.
Which statement about the train is correct?
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Solution
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Correct option is
B
It travels at constant speed for less than half of its journey time
Total journey is area under the graph = Area of increasing speed + area of constant speed + area of decreasing speed
=
2
1
×100×20+400×20+
2
1
×400×20
=1000+8000+4000=13000
Train travels for 1000km in 100s which is the acceleration part.
it travels with constant speed for 8000m
Trains is accelerated for 100s and decelerates for 400s, so decelerating take more time.
Train travels with constant speed for 400s than less than half of total journey time of 1000s