What is the definition of work?  What is the definition of energy?  A box of mass 30kg is released from rest when the length of the spring was 0.4m. The spring’s constant is 500 N/m and its natural length is 0.7m. The coefficient of friction between the box and the floor is 0.25. Using the work-energy method, Determine the forces that don’t do work,  Determine the velocity of the box when the spring becomes unstreteched,  The total distance traveled by the box from start until it comes to rest.

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What is the definition of work? 
What is the definition of energy? 

A box of mass 30kg is released from rest when the length of the spring was 0.4m. The spring’s constant is 500 N/m and its natural length is 0.7m. The coefficient of friction between the box and the floor is 0.25. Using the work-energy method,
Determine the forces that don’t do work, 
Determine the velocity of the box when the spring becomes unstreteched, 
The total distance traveled by the box from start until it comes to rest. 

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