A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms−2]

A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms−2]
A. 87N
B. 73.5N
C. 133.3N
D. 533.2N

Correct Option: Answer is C

V. R = 1Sinθ
m = 20kg
V.R = 1Sin30
= 2
Efficiency = 75%
Load = mg
= 20 x 10 = 200N
Efficiency = M.AV.R×100
75/100 = M.A2
M .A = 75×2100
M. A = 1.5
Since M. A. = LoadForce
Force = 2001.5
= 133.3N

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