how can we say that the amount of energy we need depends on the task we are
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What does the amount of energy depend on?
The amount of translational kinetic energy (from here on, the phrase kinetic energy will refer to translational kinetic energy) that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object. The following equation is used to represent the kinetic energy (KE) of an object.
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Explanation:
yes, all work can done in present of energy
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