We can use the formula for gravitational potential energy:
$W = mgh$
where $m$ is the mass of the truck, $g$ is the acceleration due to gravity, and $h$ is the height lifted. Plugging in the given values:
$W = (2700\,\text{kg})(9.8\,\text{m/s}^2)(3.0\,\text{m})
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