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Question

An insect moves along the sides of a wall of dimensions 12m × 5 m starting from one corner and reaches the diagonally opposite corner. If the insect takes 2 s for its motion, then find the ratio of average speed to average velocity of insect.


A

17 : 13

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B

12 : 5

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C

13 : 5

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D

17 : 12

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Solution

The correct option is A

17 : 13


Total distance =AB+BC=12+5=17 m
Total displacement 52+122=169=13 m [By pythagoras theorem]

Total displacement = AC
Average speedAverage velocity=Total distancetimeTotal displacementtime
=1713=17:13


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