Question

A body of mass 10 kg is lying on a rough plane inclined at an angle of 30^o to the horizontal and the coefficient of friction is 0.5. The minimum force required to pull the body up the plane is

• A. 914 N
• B. 91.4 N
• C. 9.14 N
• D. 0.914

Answer 1

Answer: (B)

91.4 N

Answer 2

$F = m g ( \sin \theta + \mu \cos \theta )$

$= 10 \times 9.8 \left( \sin 30 ^ { \circ } + 0.5 \cos 30 ^ { \circ } \right) = 91.4 \mathrm {~N}$ .