A Block of Mass M_b Rests on a Horizontal Surface

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