A couple go roller skating on a Saturday night

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A couple go roller skating on a Saturday night. The male has a mass of 48kg and the female has a mass of 40kg. Starting from rest at the center of the skating rink, the two skaters push off from each other over a time period of 1.2 seconds. The male travels 2.5 m/s and the female travels 3.0 m/s. What is the force of the push by the smaller skater? Hint: this requires the use of two formulas