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The bulb is placed at the centre of a circular track of radius 10m. 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^(@)` form P is

A

30 m/sec

B

40 m/sec

C

60 m/sec

D

80 m/sec

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