Auniform ladder is 10 m long and weighs 200 n. in fig. 12-78, the ladder leans against a vertical, frictionless wall at height h = 8.0 m above the ground. a horizontal force f → is applied to the ladder at distance d = 2.0 m from its base ( measured along the ladder). (a) if force magnitude f = 50 n, what is the force of the ground on the ladder, in unitvector notation? (b) if f = 150 n, what is the force of the ground on the ladder, also in unit-vector notation? (c) suppose the coefficient of static friction between the ladder and the ground is 0.38; for what minimum value of the force magnitude f will the base of the ladder just barely start to move toward the wall?