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 N

Answer 1

Answer: (B)

91.4 N

Answer 2

$F = mg(\sin\theta + \mu\cos\theta)$

$= 10 \times 9.8(\sin 30 + 0.5\cos 30) = 91.4N$