Answer:bill 5 m/s. Jack:10 m/s
Explanation:
Cuz I took it
This group is called “noble gases” because they do not react with other elements. This is because they have a full valence shell.
An element is a pure substance that cant be broken down into simpler substances by chemical or physical means. hope it helps :)
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<span>fast-moving particles colliding with slow-moving particles</span>