A particle moves along a line with position . At what times is the particle at rest?

Answer and explanation

Correct answer: B.

  1. Step 1: The particle is at rest when its velocity is zero (). and . **Answer: . Why not the others:** "" evaluates to and , so the particle is in motion; "" gives and , neither of which is zero; " only single" omits the earlier stationary moment at .

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A particle moves along a… | Panhellenic Examinations (Greece)