title: How to move character with permanent speed in Unity2D
body: <p>I'm creating Unity2D runner where characters is running on the ground.
  I'm trying to force him run with constant speed by applying force with right vector but the movement is jerky.</p>
  
  <p>I'm trying to achieve effect of endless run with permanent speed. It is easy in the air but works different (because of physics) when character is running on the ground.</p>