The appropriate response is a Surface wave. It is a seismic wave that goes over the surface of the Earth rather than through it. Surface waves as a rule have bigger amplitudes and longer wavelengths than body waves, and they travel more gradually than body waves do. Adore waves and Rayleigh waves are sorts of surface waves.
PART A)
Here by force balance along Y direction
Force balance along X direction
now by torque balance
PART B)
now from above equations
now net reaction force of wall is given as
Answer:
the answer is the first letter in the alphabet
