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I'm having promblem with b. I checked the solution, but I did'nt understand the logic.

Kf+Ugf+Usf =

I'm having promblem with b. I checked the solution, but I did'nt understand the logic.

Kf+Ugf+Usf =

**Ki+Ugi+Usi**

Usf= 0, Ki=0, Ugf= 0

I understand the logic's why they are equal to 0.

I don't understand why final potential of spring (Usf) is equal to zero?

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Now, I got it. I read the problem in detail.Usf= 0, Ki=0, Ugf= 0

I understand the logic's why they are equal to 0.

I don't understand why final potential of spring (Usf) is equal to zero?

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Now, I got it. I read the problem in detail.