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The slope of a velocity time graph over any interval of time gives the during that interval

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.