Asked by Angie

If a particle of mass 5.7 kg is moving east at 10 m/s and a particle of mass 19 kg is moving west at 10 m/s, what is the velocity of the center of mass of the pair? Give answer is m/s to the west.

I tired to use: Vcm = mv/M.
I plugged in (5.7)(10) + (19)(10) / 5.7+19. = 57+190/24.7 = 10m/s. This answer is wrong. Please assist.
Answered by bobpursley
Of course it is wrong. Make E + direction, W - direction.
Answered by Angie
Thank you. I don't know why I was over looking that.
Answered by Daniel Araque
(19x10)-(5.7x10) / (19+5.7) = 5.38 m/s
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