You are speeding towards a brick wall at a speed of 25m/s. The brick wall is 30 m away

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

car a and b are moving in opposite directions

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battery with hi vtge high val resist in series