A block with mass m sits on top of a block with mass 2m which sits on a table. The coefficients of friction (both static and kinetic) between all surfaces are ?s = ?k = 1. A massless string is connected to each mass and wraps halfway around a pulley. You pull on the pulley with a force of 6mg.

(a) Explain why the bottom block must slip with respect to the table. Hint: Assume that it doesn't slip, and show that this leads to a contradiction.

(b) Explain why the top block must slip with respect to the bottom block. (Same hint.)

(c) What is the acceleration of your hand

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