A large cube of mass M is pushed along a frictionless horizontal surface. A small block of mass m is held to the vertical front of the cube. The coefficient of static friction between the cube and the block is μs.
A) What is the minimum acceleration of the cube that ensures the small block does not slide down?
B) If the cube is accelerated by means of a horizontal pushing force P, what is the smallest magnitude of P that ensures the block does not slide?