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Which of the following statements is true?


An astronaut in orbit cannot be weightless because she is falling toward Earth.


A student cannot push her teacher across the room in a rolling desk chair unless the chair is already moving because the action and reaction forces between the student and the chair will cancel each other out resulting in zero net force.


When a person jumps off the ground the forces internal to his legs are accelerating him upward.


When you turn your car to the right at high speed centrifugal force pushes you into the car door on your left.

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