1) The figure 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
(A) 1.0 m/s2 to the right
(B) 1.0 m/s2 to the left
(C) 2.0 m/s2 to the right
(D) 2.0 m/s2 to the left