Given:
Initial velocity, \( u = 60 \, \text{km/s} \)
Final velocity, \( v = 55 \, \text{km/s} \)
Time, \( t = 20 \, \text{s} \)
Using the formula:
\[ a = \frac{v - u}{t} \]
\[ a = \frac{55 - 60}{20} \]
\[ a = \frac{-5}{20} \]
\[ a = -0.25 \, \text{km/s}^2 \]
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