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Mathematics, 28.04.2021 01:00 olivia0420

Your brother is riding in a hot-air balloon over a lake. From an altitude of 4000 feet,
he throws a rock straight down toward the
water. When the rock leaves his hand, its
speed is 30 feet per second. How long will
it take the rock to hit the water?

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Your brother is riding in a hot-air balloon over a lake. From an altitude of 4000 feet,
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