What are the three factors that determine an object's mechanical energy

The ability to accurately gauge the distance of the coffee cup on your desk as you reach for it is called:

Which of the following is not a result of increased democracy in russia?

Which of the following  bestillustrates a negative reinforcer?               a.  copland gives up candy to stave off chronic acid indigestion.    b.  nancy learns that she prefers chocolate over vanilla.    c.  carmine changes his major to english lit after failing a math exam.    d.  on a hot day, lindberg always drinks lemonade.