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7. You drop a rock into a lake, creating circular water waves that propagate outward from the impact location. Using only one other rock, is

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7. You drop a rock into a lake, creating circular water waves that propagate outward from the impact location. Using only one other rock, is it possible for you to nd a location, and timeofdrop, Where you can drop the second rock to completely cancel out the waves from the rst? (10 points)

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