Let $a$ be the deceleration of the car.
Using the equation of motion $v^2 = u^2 + 2as$, where $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration, and $s$ is the distance, we have:
$0 = v_1^2 + 2ad$ (since the car stops, $v=0$)
$v_1^2 =
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