A 60-Kg Block Slides Along a Horizontal Surface

question 52

Multiple Choice

A 6.0-kg block slides along a horizontal surface.If µ_k = 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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