Unlimited Power!

Would not physically work seeing as they are connected to the same piece of metal, so the internal electrical magnetic field would be the same for both objects, making the external magnetic field the same, so the cart would not move. Perhaps if the magnet was hung from a string.

Swingkid, I would just like to apologize for ruining your dream (if you made this)

Otherwise, I apologize for bringing logic to your lulz

Looks like a Toyota

it would tear the cart off of the support...

Actually, shit would stop accelerating at some point.

It would eventually take more energy to accelerate, than the magnetic force provides.

And there's our daily dose of Physics.