An astronaut in a space capsule is experiencing "weightlessness"; therefore, he does not have to exert any force in order to throw a ball, which is also weightless.

Name: An astronaut in a space capsule is experiencing "weightlessness"; therefore, he does not have to exert any force in order to throw a ball, which is also weightless.
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Quizplus · Accepted Answer

Even in a state of "weightlessness," inertia still applies. The astronaut must exert force to change the ball's state of motion, as per Newton's first law of motion.

An Astronaut in a Space Capsule Is Experiencing "Weightlessness"; Therefore