A Box M = 20 Kg) Is Sitting on a Horizontal

Multiple Choice

A box M = 20 kg) is sitting on a horizontal surface. It is connected to a massless hook by a light string passing over a massless pulley wheel. The coefficients of friction between the box and the surface are 0.80 static) and 0.30 kinetic) . If 15 kg in total) are placed on the hook, calculate the acceleration of the box.

A) 9.8 m/s²
B) 4.4 m/s²
C) 2.5 m/s²
D) 12 m/s²
E) 0