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

Question

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

Quizplus · Accepted Answer

The Answer of 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

The Two Masses in the Figure Are Released from Rest