A Block of Mass M_b Rests on a Horizontal Surface

Multiple Choice

A block of mass m_b rests on a horizontal surface and is accelerated by means of a horizontal cord that passes over a frictionless peg to a hanging weight of mass m_w. The coefficient of kinetic friction between the block and the horizontal surface is µ and the tension in the cord is T. The acceleration of the block is given by

A) T - m_wg) /m_w + m_b) .
B) T/µm_bg + m_b) .
C) T - µm_b) /m_b.
D) m_wg - T) /m_w.
E) T/m_b - µm_bg.