A 30-Kg Uniform Ladder 12 M Long Is Leaning Against

Multiple Choice

A 30-kg uniform ladder 12 m long is leaning against a frictionless wall at an angle of 50 degrees above the horizontal.A 45-kg boy climbs 5.0 m up the ladder.What is the magnitude of the force exerted by the ladder on the wall?

A) 200 N
B) 110 N
C) 280 N
D) 140 N
E) 550 N