We know the initial velocity ($v_i = 0$), the final velocity ($v_f = 7.8 m/s$), and the distance the block is lifted ($d = 6.8 m$). We can use the following kinematic equation to find the acceleration:
$$v_f^2 = v_i^2 + 2ad$$
Plugging in the values, we get:
$$(7.8
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