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What is the system linear momentum of a pair of identical 0.16 kg billiard balls if...

What is the system linear momentum of a pair of identical 0.16 kg billiard balls if the first ball moves due east at 2.5 m/s and the second ball moves 30° due north of east at 3.1 m/s? Use East as 0° with rotation from east toward north as positive.

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Answer #1

Lets consider east direction to be positive x-axis and north to be positive y-axis,

Now,

Linear momentum of the first ball is, ​​​​​​

Linear momentum of the second ball is,

Linear momentum of the system is,

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