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