Question

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suppose that a car moves along a straight line in the positive x - direction of a coordinate system. let any velocity in the positive x - direction be defined as a positive velocity. if the cars acceleration is calculated to be negative, then the cars speed is

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Explanation:

Step1: Understand acceleration - velocity relation

Acceleration is rate of change of velocity. Negative acceleration means velocity is decreasing.

Step2: Determine car's speed change

Since speed is magnitude of velocity and velocity is decreasing (due to negative acceleration), the car's speed is decreasing.

Answer:

decreasing