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Question

A particle is moving in a circular path of radius r, the displacement and distance after covering half a circle would be:

A
Zero,πr
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B
πr, Zero
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C
2r,Zero
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D
2r,πr
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Solution

The correct option is D 2r,πr
Given, radius of the circle is 'r'.

Circumference of circle =2πr
Distance travelled after half a circle
=2πr2=πr

But displacement is the shortest path between the final position and initial position.
In this case, it is the diameter, which is 2r.

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