Can someone explain this Energy Problem

[Lori]

So- I'm going to 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.

 

[PeroK]

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]

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]

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.