A person pushes a block of mass with a constant speed of straight up a flat surface…

PHYSICS · Single correct · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion

Problem

36. A person pushes a block of mass

\mathrm{M}=6.0 \mathrm{~kg}

with a constant speed of

5.0 \mathrm{~m} / \mathrm{s}

straight up a flat surface inclined

30.0^{\circ}

above the horizontal. The coefficient of kinetic friction between the block and the surface is

\mu=0.40

. What is the net force acting on the block? (A) 0 N (B) 21 N (C) 30 N (D) 51 N