# Can someone explain this Energy Problem

• I
Lori
So- I'm gonna confused with the concept of total mechanical energy that's loss due to work other. I provided an example below.

When do I apply this equation of Wother=E2-E2? I get confused cause I thought frictionless meant that energy is conserved. #### Attachments

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PeroK
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Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?

Lori
Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?
I know that, but I want to understand it with the work energy theorem. I don't really understand it.

PeroK
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2020 Award
I know that, but I want to understand it with the work energy theorem. I don't really understand it.
Why not calculate the height both blocks reach?

Lori
Why not calculate the height both blocks reach?
Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?

PeroK
Homework Helper
Gold Member
2020 Award
Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?
Yes, that's it.