Block pulled with a changing angle A block of mass 1.89 kg is accelerated across a rough surface by a rope passing over a pulley, as shown in the figure below. The tension in the rope is 12.4 N and the pulley is 11.5 cm above the block. The coefficient of kinetic friction is 0.370. 8 a Determine the acceleration in m/s2 of the block when x = 0.375 m. 8 b Calculate the value of x (in m) at which the acceleration becomes zero.