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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a gust of wind blowing east pushes against a ball. when will the wind do work on the ball?
the wind has done a work on the ball , because a force aced on the ball and a displacement occur, work= product of force and displacement
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