Which statement is true about the law of conservation of energy for an object released from a certain height above the ground? a. in the absence of any external forces and at any point, the kinetic energy and the potential energy are always equal. b. in the absence of any external forces and at any point, the kinetic energy is always greater than the potential energy. c. in the absence of external forces and at any point, the potential energy is always greater than the kinetic energy. d. in the absence of external forces and at any point, the sum of the kinetic energy and the potential energy is always constant.
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Mary starts from her house, walks 80 meters south, and stops to chat with her aunt on the sidewalk. after chatting for a few minutes, she walks 125 meters to the west to meet a friend and then walks 45 meters north with her friend to a cafe for lunch. overall, she takes 10 minutes to do all this. what is mary’s average speed?
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Which statement is true about the law of conservation of energy for an object released from a certai...
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