Calculate the momentum of POSITION A.?

?2021-02-15T13:18:16Z

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mass A has momentum
3kg * 5m/s [right] = 15 kg·m/s [right]

oubaas2021-02-15T05:09:49Z

Pa = 3kg * 5 m/sec = 15 kg*m/sec 
Pc = 3*5+3*2+3*-4 = 9 kg*m/sec to the right