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WAEC - Physics (1996 - No. 6)

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)
25N
90N
96N
250N
960N

स्पष्टीकरण

Efficiency =
M.A/V.R
x 100%

=
80/100
=
120 x 10/E

E = 250N

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