A 60-Kg Block Slides Along a Horizontal Surface

question 10

Multiple Choice

A 6.0-kg block slides along a horizontal surface. If µk = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?

• A)−59 W
• B)−47 W
• C)−71 W
• D)−82 W
• E)+71 W

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