an 80-kg man is one fourth of the way up the 10-m ladder that is resting against a smooth, frictionless wall.

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

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