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 30 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder

a. 7.8 × 10^2 N
c. 50 N
b. 2.0 × 10^2 N
d. 1.7 × 10^2 N


B

Physics & Space Science

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