Posted by **Cavin** on Friday, March 2, 2007 at 1:31am.

Two balls are approaching each other head on. Their velocities are + 9.55 and -11.0 m/s

(a) Determine the velocity of the center of mass of the two balls if they have the same mass.

(b) Determine the velocity of the center of mass of the two balls if the mass of one ball(v=9.55m/s) is twice the mass of the other ball (v=11.0m/s)

(a) mv1 + mv2 = 2m V

where v is the center-of-mass velocity

V = (v1 + v2)/2 = -1.45/2 = -0.725 m/s

(b)2mv1 + v2 = 3m V

solve for V

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