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When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Quantum mechanics applies to subatomic, atomic, nanometer-size, and micrometer-size systems. nanometer, micrometer, and kilometer-size systems. atomic, nanometer-size, and micrometer-size systems. subatomic, atomic, and nanometer-size systems.

The discovery of the electron as a subatomic particle was a result of