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

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Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction