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Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 66 kg skater acquires

Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 66 kg skater acquires a speed of 0.67 m/s. If the speed of the other ice skater is 0.89 m/s, what is this skater's mass? express answer in kilograms

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