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AP Physics 1/Unit 1 – Kinematics
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Relative Velocity of a Probe

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A rocket travels at a speed of 0.5c0.5c relative to Earth. The rocket launches a probe in the same direction at a speed of 0.4c0.4c relative to the rocket. What is the speed of the probe as measured by an observer on Earth?

A

0.5c

B

0.75c

C

0.9c

D

0.2c

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