We can use the following kinematic equation:
$v^2 = u^2 + 2as$
where:
$v$ is the final velocity (4.0 m/s)
$u$ is the initial velocity (0 m/s, since the block starts from rest)
$a$ is the acceleration
$s$ is the distance traveled (2.0 m)
Plugging in the values, we
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