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AP Physics 1
4.3 Conservation of Linear Momentum
2.6 Gravitational Force
2.1 Systems and Center of Mass
Multi-Unit
IntermediateMCQMathematicalConceptual17.5k
A binary system of two stars initially at rest in deep space.
A binary system of two stars initially at rest in deep space.
Two stars, Star 1 of mass \(M\) and Star 2 of mass \(4M\), are initially at rest in an isolated region of space. The stars begin to move toward each other due to their mutual gravitational attraction. At a certain time \(t\), Star 1 has a speed \(v_1\). Which of the following correctly identifies the speed of Star 2, \(v_2\), and the speed of the center of mass of the two-star system, \(v_{cm}\), at time \(t\)?

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