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4. A 50 kg man stands on the middle rung of a 50 kg ladder as shown. Assuming the floor and wall are
perfectly smooth and that slipping is prevented by a string DE.
a. Find the reaction at B.
b.
C.
Find the reaction at A.
Find the tension in string DE.
12m
150 kg
50 kg
6m
30%
B
E

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