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A bulb is placed at the centre of a circular track of radius 10 m. A vertical wall is erected
touching the track at a point P. A man is running along the track with a speed of
10 m/sec. Starting from P the speed with which his shadow is running along the wall
when he is at an angular distance of 60° from P is
23.
(A) 30 m/sec
(B) 40 m/sec
(C)
60 m/sec
(D) 80 m/sec

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