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3 boys are pulling a heavy trolley by me...

`3` boys are pulling a heavy trolley by means of `3` ropes. The boy in the middle is exerting a pull of `100 N`. The other `2` boys, whose ropes both make an angle of `30^(@)` with the centre rope, are pulling with forces of `50 sqrt(3)N` & `100 sqrt(3)N`. Find the magnitude of the resultant pull the trolley. Consider all the forces in the same plane.

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