1. The figure below shows the forces exerted on a block that is sliding to the right 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.
40 N
40 N
The acceleration of the block is most nearly
a. 1 m/s? to the right
b. 2 m/s to the right
C. 1 m/s? to the left
d. 2 m/s? to the left