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A crane stands on a level ground. It is ...

A crane stands on a level ground. It is represented by a tower ABCD, of height 11 m and a jib BR. The ib is of length 20 m and can rotate in a vertical plane about B.A vertical cable, RS, carries a load S. the diagram shows current position of the jib, cable and load.


The length BS is

A

8 m

B

12 m

C

13.9 m

D

17.9 m

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