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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The Answer of 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

A 60-Kg Block Slides Along a Horizontal Surface