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Physics 7 Online
OpenStudy (megannicole51):

If a pebble is dropped into a pond in the shape of an ellipse at the location of one focus, the waves will converge at the location of the other focus. If the pond has a major axis of 68 feet and a minor axis of 32 feet, how far apart are the foci? (a) 30 ft (b) 36 ft (c) 54 ft (d) 60 ft

OpenStudy (anonymous):

b.

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