Conservation of Momentum Homework Help

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To solve the problem of finding Ashley's mass after she and Gerald push off each other, the principle of conservation of momentum is applied. The total momentum before they push off is zero, as they are stationary. After they push off, the momentum of Gerald (110 kg moving at 3 m/s) and Ashley (unknown mass moving at 5 m/s) must equal zero. The equation used is: 110 kg * 3 m/s + mass of Ashley * (-5 m/s) = 0. Solving this equation reveals Ashley's mass.
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Gerald and Ashley stand face to face on some ice. They push off against each other and move apart from each other in opposite directions. Gerald moves with a velocity of 3m/s and Ashley moves with a velocity of 5m/s. If Gerald has a mass of 110 kg, what is Ashley's mass?
 
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Can you show your attempt at this question and what formula(s) you think you will need.
 
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