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A Tesla Model S is 4.98 m long. How fast would it have to go past...

A Tesla Model S is 4.98 m long. How fast would it have to go past a stationary observer for it to appear to be 4.50 m long? Express your answer as a fraction of c, in m/s, and in mph.

4. Two spaceships are traveling through space when one spaceship fires a missile at the other one at 0.821c.

a. What is the relative velocity of the two spaceships if the second spaceship observes the missile approaching at 0.943c?

b. Are the spaceships traveling toward each other or away from each other?

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