Maximum mechanical energy in the spring-block system

[Vibhor]

One last question , am I right in concluding that during the course of motion the work done by external agent pulling the free end would be both positive and negative ? Alternate positive and negative work would be done by the agent .

??

 

[TSny]

One last question , am I right in concluding that during the course of motion the work done by external agent pulling the freed end would be both positive and negative ? Alternate positive and negative work would be done by the agent .

??

Yes, there are times when the pulling force is doing positive work and times when it is doing negative work. The total work done (starting at t = 0) varies between 0 and 2mv² over and over again. So, the total work done since the start is never negative.

 

[Vibhor]

Thank you very much Sir .