An 80-Kg Man Is One Fourth of the Way Up $\degree$

Multiple Choice

An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth,frictionless wall.If the ladder has a mass of 20 kg and it makes an angle of 60 $\degree$ with the ground,find the force of friction of the ground on the foot of the ladder.

A) 7.8 x 10² N
B) 2.0 x 10² N
C) 50 N
D) 1.7 x 10² N