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A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the
incline at constant velocity?
O a. 18.9 N
O b. 16.1 N
O c. 11.8 N
O d. 26.0 N
O e. 14.0 N

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