To clean up the broken pieces of rock, the rangers fill wheelbarrows and load them into a truck. What would be the best simple machine to move the wheelbarrows from the ground to the truck bed, which is a few feet off the ground?
A boulder is sitting atop a hill in a park with a steep slope next to it. It appears to be a very large boulder and is perched precariously close to a pathway. The park rangers are unsure what to do with the boulder, as it poses a threat to passersby.
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