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True/Faise 13. A force acting in the direction an object is moving does positive work. 14. Kinetic energy is a vector quantity. 15. The gravitational potential energy of a moving object is always zero. 16. When mechanical energy is conserved, the kinetic energy you end up with always equ gravitational potential energy you start with. 17. A force acting perpendicular to an object's displacement does negative work. 18. Energy can be converted from one form to another form. 19. The force needed to lift an object at a constant speed is equal to the weight of the ob 20. Centripetal forces do zero work on an object.
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