Opposite Forces
When ever something is pushed or pulled there is always an
opposite force pushing or pulling the other way!
If one end of a spring is held down and you pull the other end
you can feel a force pulling the spring back against you!
  The safety car above is pulling a broken down formula 1 car
As it pulls it off the track to safety a second opposite force is pulling the other way
causing the safety car to slow down from it's normal speed!
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