A 20-Kg Block Slides Down a Plane (Inclined at 40° with with the Horizontal)

question 46

Multiple Choice

A 2.0-kg block slides down a plane (inclined at 40° with the horizontal) at a constant speed of 5.0 m/s. At what rate is the gravitational force on the block doing work?

• A) +98 W
• B) +63 W
• C) zero
• D) +75 W
• E) −75 W

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