The Two Masses in the Figure Are Released from Rest

question 40

Multiple Choice

The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?

• A) −12 J
• B) −17 J
• C) −20 J
• D) −8.0 J
• E) −28 J

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