Question

A block p of mass m is placed on a horizontal frictionless surface . another block q of same mass is kept on p and connected to the wall with the help of a spring constant k as sown. mu is the coefficient of friction between p and q . the blocks move together performing shm of amplitude

a. the maximum value of the friction force between p and q is

Answer 1

1/2 MV2
then
1/2KA
I know this is short answer