Two Masses Are Connected by a String Which Passes Over $3.00 \mathrm{~kg}$

Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction of 0.200 . The vertically hanging mass is $3.00 \mathrm{~kg}$ and the mass on the horizontal surface is $3.00 \mathrm{~kg}$ . The magnitude of the acceleration of the vertically hanging mass is (the initial velocity of the horizontal mass is to the right)

A) $2.00 \mathrm{~m} / \mathrm{s}^{2}$ .
B) $4.02 \mathrm{~m} / \mathrm{s}^{2}$ .
C) $7.16 \mathrm{~m} / \mathrm{s}^{2}$ .
D) $5.88 \mathrm{~m} / \mathrm{s}^{2}$ .
E) $3.53 \mathrm{~m} / \mathrm{s}^{2}$ .