A block rests on a rough incline making an angle of with the horizontal ( )

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

Problem

5\,\text{kg}

block rests on a rough incline making an angle of

20^{\circ}

with the horizontal (

\cos 20^{\circ}=0.94

). The coefficient of static friction is

0.40

. What minimum force, applied parallel to the incline and directed upward along it, will just start moving the block up the plane? (Take

g = 10\,\text{m s}^{-2}

.) (a)

45\,\text{N}

(b)

36\,\text{N}

(c)

25\,\text{N}

(d)

30\,\text{N}