The Two Masses in the Figure Are Released from Rest

question 68

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

---

Definitions:

Celler-Kefauver

A United States antitrust law passed in 1950, amending the Clayton Act to prevent corporate acquisitions that could reduce competition.

European Commission

An institution of the European Union responsible for proposing legislation, implementing decisions, upholding the EU treaties, and managing the day-to-day business of the EU.

Boeing

An American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and telecommunications equipment globally.

McDonnell Douglas

A major American aerospace manufacturing corporation and defense contractor, merged with Boeing in 1997.