Sam is cruising in his spaceship moving at $0.9 c$ . Suzy is directly in front of Sam and is at rest. Suzy flashes her headlights at Sam, hoping he will slow down. According to Sam, how fast is the light from Suzy's headlights moving as it approaches him?

0.1 c

0.75 c

0.9 c

1.9 c

c

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Sam is cruising in his spaceship moving at 0.9c. Suzy is directly in front of Sam and is at rest. Suzy flashes her headlights at Sam, hoping he will slow down. According to Sam, how fast is the light from Suzy's headlights moving as it approaches him?