A load of 3000N balanced by a concrete block of weight (W) on the jib of a crane. The concrete block can be along the jib. Calculate the weight of concrete block W.
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Weight = mg
Mass of brick, m = W / g = 20N / 10ms-2 = 2kg
Resultant force F on brick = ma
Resultant force on brick = 10 – 4 N = 6N
Acceleration a = F / m = 6 / 2 = 3ms-2 .
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