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