Frame S’ moves relative to frame S at speed of 2.4 × 108 m/s in the direction of increasing x. An object is fired in frame S’ at a speed of 1.8 × 108 m/s in the direction of increasing x’. The speed of the object according to an observer in frame S is:
1
1.2 × 108 m/s
2
2.0 × 108 m/s
3
2.8 × 108 m/s
4
1.6 × 108 m/s
5
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