Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts by Arthur's side at the same time and runs back and forth between them at 5.0 m/s
By the time Arthur and Betty meet, what distance has Spot run?
100 m
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Two point charges of +2.0 ?C and -6.0 ?C are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively
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