A push or pull that causes an object's motion to change is called

Force

Explanation:

Force is a pull or push that causes An objects motion to change . When force is applied to an object , it either pushes the object to or pulls it from something thereby changing the motion of the object. A good example is the earth’s gravitational force. This force pulls or attracts a body to the center of the earth . Another example Is experienced when kicking a football from one part of a football field to another. The ball is kicked with force and this causes it to move from one place another .

pe = weightxheight = 2000x1000=2,000,000joules

answer; equivalent to a one(1) horsepower motor;