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Power is scalar or vector, please explain,
Scalar is not directional, such as a single number; vector is directional, such as coordinates
So power is not directional, but scalar, of course~
Is energy a scalar or a vector
Since there are "negative" energy and "positive" energy, is energy a scalar or a vector?
Energy is scalar; scalar: only size, no direction vector: both direction and size. How can energy have direction? To distinguish the transfer of energy, energy can be transferred from one object to another
Is kinetic energy scalar or vector
Scalar
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