The figure above shows the forces exerted on a block that is sliding on a horizontal surface: the gravitational force of 40 N, the 40 N normal force exerted by the surface, and a frictional force exerted to the left. The coefficient of friction between the block and the surface is 0.20. The acceleration of the block is most nearly Responses 1.0 m/s2 to the right 1.0 m/s 2 to the right 1.0 m/s2 to the left 1.0 m/s 2 to the left 2.0 m/s2 to the right 2.0 m/s 2 to the right 2.0 m/s2 to the left