Q 3001123928.     A ladder is inclined to a wall making and angle of `30^0` with it. A man is ascending the ladder at the rate of `2\ \text{m/s}`. How fast is he approaching the wall?

A

`2` m/s

B

`1.5` m/s

C

`1` m/s

D

`0.5` m/s

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