$The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40$^o$, then the value of W is$

The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40 $^o$ , then the value of W is

28.0N

48.0N

288.0N

50.0N

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Correct answer is D

V.E = 6, load = 120N

Efficiency = M.A x $\frac{1}{V.R}$ x 100%

40 = $\frac{120}{effort}$ x $\frac{1}{6}$ x $\frac{100}{1}$

Effort = 50N

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