What is the difference between earth's magnetic and geographic poles? how do navigators take advantage of this?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

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You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.