What are positive and negative acceleration in straight line motion?

Explanation

To understand positive and negative acceleration in straight line motion, we can break it down into a few steps:

### Step 1: Understand Acceleration
Acceleration is defined as the rate of change of velocity over time. Mathematically, it can be expressed as:
\[ a = \frac{\Delta v}{\Delta t} \]
where \( a \) is acceleration, \( \Delta v \) is the change in velocity, and \( \Delta t \) is the change in time.
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