To determine the acceleration, we can use the formula for acceleration:
\[ a = \frac{{v_f - v_i}}{{t}} \]
where:
- \( v_f \) is the final velocity,
- \( v_i \) is the initial velocity,
- \( t \) is the time.
In this case:
- \( v_f = 25 , \text{m/s} \)
- \( v_i = 65 , \text{m/s} \)
- \( t = 10 , \text{s} \)
Now, substituting the values into the formula:
\[ a = \frac{{25 , \text{m/s} - 65 , \text{m/s}}}{{10 , \text{s}}} \]
\[ a = \frac{{-40 , \text{m/s}}}{{10 , \text{s}}} \]
\[ a = -4 , \text{m/s}^2 \]
Since the acceleration is negative, this indicates that the object is decelerating (slowing down).
Thus, the correct description of the acceleration is negative acceleration of 4 m/s².
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