The truck is described as travelling at 30mph to the west. the quantity described here is a(n) a.)speed b.)velocity c.)acceleration d.)kinetic energy

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The correct answer is B velocity

Velocity means a speed of an object in this case the truck traveling in a given direction.

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a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it