A 1000-kg car traveling east at 24 m/s collides with a 2000-kg car traveling west at 21 m/s. The cars lock together. What is their velocity immediately after the collision?
(a) 3 m/s east (b) 3 m/s west (c) 6 m/s east (d) 6 m/s west (e) 15 m/s east
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