The Two Masses in the Figure Are Released from Rest

question 32

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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