16 of 20 When a rock is dropped, the Earth exerts a force on the rock, and the rock exerts a force of lesser magnitude on the Earth. does not exert any force on the Earth. exerts a force of greater magnitude on the Earth. exerts a force of equal magnitude on the Earth. Question 17 of 20 A horse exerts a 500 N force on a heavy wagon causing it to accelerate. How much force does the wagon exert on the horse? Less than 500 N 500 N Greater than 500 N Not enough information provided. Question 18 of 20 When A exerts a force on B, then B exerts an equal and opposite force on A. This is a statement of Newton's Third Law of Motion. Second Law of Motion. First Law of Motion. Law of Gravity. Question 19 of 20 A student pushes a desk horizontally with constant non-zero velocity along a rough surface with significant friction. Which of the following is true? The student applies a force greater than the frictional force. The student applies a force equal to the frictional force. The student applies a force less than the frictional force. The coefficient of kinetic friction is greater the coefficient static friction. Question 20 of 20 A force of 26 N is needed to overcome a frictional force of 5 N to accelerate a 3 kg mass across a floor. What is the acceleration of the mass? 5 m/s2 7 m/s2 20 m/s2 60 m/s2