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time = 10 second.
initial speed = 150 m/s
final speed = 0
the deceleration of the car for 10 second is
[tex]=\frac{\text{ final speed - initial}}{\text{10 s}}[/tex][tex]\begin{gathered} =\frac{150-0}{10} \\ =15m/sec^2 \end{gathered}[/tex]so the answer is 15 m/s2