Two identical cars are driving in opposite directions at the same speed. Their kinetic energies have . Two identical cars are driving in opposite directions at the same speed. Their kinetic energies have . the same magnitude and sign different magnitudes and opposite signs the same magnitude, but opposite signs different magnitudes, but the same sign

1) The same magnitude and sign

Explanation:

1) -The kinetic energy of a moving object is always positive, regardless of the direction it is moving in, or the coordinate system used

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."