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Andrej [43]
3 years ago
13

Which statement correctly describes the differences between positive and negative acceleration? Positive acceleration describes

a change in speed; negative acceleration describes no change in speed. Positive acceleration describes no change in speed; negative acceleration describes a change in speed. Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. Positive acceleration describes a decrease in speed; negative acceleration describes an increase in speed.
Physics
2 answers:
salantis [7]3 years ago
7 0

Answer:

Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.

Explanation:

Acceleration is defined as:

a=\frac{v-u}{\Delta t}

where

v is the final velocity

u is the initial velocity

\Delta t is the time taken for the change in velocity to occur

The value of \Delta t is always positive, so the sign of the acceleration depends on the numerator. More specifically, we have two situations:

- if v > u, then it means that the final velocity is greater than the initial velocity, so the acceleration is positive and the speed is increasing

- if v < u, then it means that the final velocity is smaller than the initial velocity, so the acceleration is negative and the speed is decreasing

qwelly [4]3 years ago
4 0

The correct answer is - Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.

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