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I have no idea what to do with this problem. Please help me found the basic formula.

When Apollo 15 astronaut David Scott dropped a hammer and a feather on the moon to demonstrate that in a vacuum all bodies fall with the same constant acceleration, he dropped them from about 4 feet above the ground. If acceleration due to gravity is -5.2 ft/sec^2 on the moon, how long did it take the items to hit the ground?

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