A toy vehicle can roll freely along a straight track. A bar magnet is fixed lengthways inside the vehicle, with its south pole at the rear. The south pole of a second bar magnet is held close to the front of the vehicle. Which statement is correct?
The vehicle rolls towards the second magnet.
The vehicle remains still until the magnets touch.
The vehicle rolls away from the second magnet.
The vehicle remains still because only its rear is magnetic.