Easy question

[Tom]

If an object is underground, how can it move above ground, without using motors?

 

[Met Driver]

Get a push from the 'object' behind, by any chance?

 

[Tom]

Nup, without using pressure of any type.

 

[Dave A]

A Very strong magnet

 

[Tom]

Without using pressure of any type.

 

[Ben]

down hill slope under ground?

 

[Tom]

Half correct TPE.

 

[jd]

Erosion. Ground above is eroded over time, until the thing is exposed at the surface. 8)

 

[Tom]

No, we are in a tube train here, the momentum moves it down a hill (as TPE said), but how does it get ABOVE ground, rather than underground? Note, I gave away the answer in this explanation, so see if you can get it.

 

[evil_hippo]

It is under a hill with an edge at a greater angle than its slope.

 

[Tom]

Well done, evil_hippo, you are correct.

 

[evil_hippo]

Yay. I love me.