what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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calculate the change in potential energy of 8 million kg of water dropping 50 m over niagara falls
a) 4billion joules b) 400million joules c) 160000 joules d) 50joules
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