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Determine the signs (positive or negative) of the position, velocity, and acceleration for the particle in Figure Q1.8.

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Solution:

The particle position is above zero on the y-axis, so its position is positive. The particle is moving up, so its velocity is positive. The particle’s speed is increasing as it moves in the positive direction, so its acceleration vector points in the same direction as its velocity vector (i.e., up). Thus, the acceleration is also positive.

Position	Positive
Velocity	Positive
Acceleration	Positive

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