A Uniform Ladder Is 10 M Long and Weighs 400

Multiple Choice

A uniform ladder is 10 m long and weighs 400 N.It rests with its upper end against a frictionless vertical wall.Its lower end rests on the ground and is prevented from slipping by a peg driven into the ground.The ladder makes a 30 ° angle with the horizontal.The force exerted on the wall by the ladder is:

A) 47 N
B) 74 N
C) 120 N
D) 350 N
E) 460 N