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7-19.

A point travels along the x-axis so that at time t its position is given by , where . Homework Help ✎

  1. ​What does represent?

    The point's position along the x-axis.

  2. Where is the particle located when ?

    Calculate .

  3. What is the velocity of the particle when its acceleration is zero?

    Velocity is the derivative of position, and acceleration is the derivative of velocity.