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 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
$2\pi $
- B
$\sqrt 2 \pi $
- C
$\sqrt {{\pi ^2} + 4} $
- D
$\pi$
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