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Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

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.

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m