A 30-Kg Block Moves Up a 40° Incline with Constant Speed

question 54

Multiple Choice

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?

• A) 14 N
• B) 12 N
• C) 16 N
• D) 18 N
• E) 25 N

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