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Question

A wheel of radius 1 meter rolls forward half a revolution on a horizontal ground. The magnitude of the displacement of the point of the wheel initially in contact with the ground is

A
2π
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B
2π
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C
π2+4
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D
π
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Solution

The correct option is C π2+4

Horizontal distance covered by the wheel in half revolution = π R

So the displacement of the point which was initially in contact with ground = AA=(πR)2+(2R)2
=Rπ2+4=π2+4 (As R=1 m)


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