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
B)(-17
C)(-20
D)(-8.0
E)(-28

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 
B)(-17 
C)(-20 
D)(-8.0 
E)(-28

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 
B)(-17 
C)(-20 
D)(-8.0 
E)(-28

The Two Masses in the Figure Are Released from Rest