A Uniform Sign Is Supported Against a Wall at Point

Multiple Choice

A uniform sign is supported against a wall at point P as shown in the figure. If the sign is a square 0.40 m on a side and its mass is 4.0 kg, what is the magnitude of the horizontal force that the wall at P experiences?

A) 20 N
B) 0.00 N
C) 7.8 N
D) 98 N