The velocity of a car changes from `-5 m s^(-1)` to` -7 m s^(-1)` in 2 s. What is the acceleration of the car? What does the negative sign suggest?

Explanation

To find the acceleration of the car, we can use the formula for acceleration, which is defined as the change in velocity divided by the time taken for that change. The formula is:

\[ a = \frac{v_f - v_i}{t} \]

Where:
- \( a \) is the acceleration,
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