A 1,000 kg car moving east at 5 m/s collides with a 2,000 kg car moving east at 2 m/s. After the collision, the 2,000 kg car moves east at 5 m/s. What is the final velocity of the 1,000 kg car?

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

i think its 100.

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