A 20-kg mass is fastened to a light spring (k = 380 N/m) that passes over a pulley as shown. The pulley is frictionless, and the mass is released from rest when the spring is unstretched. After the mass has dropped 0.40 m, what is its speed?
A)2.2 m/s
B)2.5 m/s
C)1.9 m/s
D)1.5 m/s
E)3.6 m/s

Question

A 20-kg mass is fastened to a light spring (k = 380 N/m) that passes over a pulley as shown. The pulley is frictionless, and the mass is released from rest when the spring is unstretched. After the mass has dropped 0.40 m, what is its speed? 
A)2.2 m/s 
B)2.5 m/s 
C)1.9 m/s 
D)1.5 m/s 
E)3.6 m/s

Quizplus · Accepted Answer

The Answer of A 20-kg mass is fastened to a light spring (k = 380 N/m) that passes over a pulley as shown. The pulley is frictionless, and the mass is released from rest when the spring is unstretched. After the mass has dropped 0.40 m, what is its speed? 
A)2.2 m/s 
B)2.5 m/s 
C)1.9 m/s 
D)1.5 m/s 
E)3.6 m/s

A 20-Kg Mass Is Fastened to a Light Spring (K