A 30-Kg Block Is Dragged Over a Rough Horizontal Surface by by a Constant

question 31

Multiple Choice

A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?

• A)−34 J
• B)−64 J
• C)−30 J
• D)−94 J
• E)+64 J

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