- A billiard ball moving at 4.0 m/s [S] strikes two other billiard balls at rest. After the impact, the two target balls move with velocities of 1.6 m/s [S 60° E] and 2.8 m/s [SW]. The mass of each billiard ball is 5.0 x 10^-1 kg. Find:
a) The velocity of the incident billiard ball after the impact
b) The kinetic energy lost during the impact
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