Explain why it took so long for psychology to be recognized and what things it to get recognized.

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

How would doubling the made of an object change the objects potential energy

What are two different ways you could find the value of a? explain these methods.