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A rigid rod leans against a vertical wal...

A rigid rod leans against a vertical wall (y-axis) as shwon in figure. The other end of the rod is ion the horizontal floor. Point A is pushed downwards with constant velocity. Path of the centre of the rod is

A

a parabola

B

an ellipse

C

a circle of radius `l//2` and centre at origin

D

a circle of radius `l//2` but centre not at origin

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