Identicaltwins, each with mass 57.3 kg, are onice skates and at rest on a frozen

Question

Identicaltwins, each with mass 57.3 kg, are onice skates and at rest on a frozen lake, which may be taken asfrictionless. Twin A is carrying a backpack of mass 12.0 kg. Shethrows it horizontally at 2.50 m/s toTwin B. Neglecting any gravity effects, what are the subsequentspeeds of Twin A and Twin B?
Twin A 1 m/s Twin B 2 m/s Identicaltwins, each with mass 57.3 kg, are onice skates and at rest on a frozen lake, which may be taken asfrictionless. Twin A is carrying a backpack of mass 12.0 kg. Shethrows it horizontally at 2.50 m/s toTwin B. Neglecting any gravity effects, what are the subsequentspeeds of Twin A and Twin B?
Twin A 1 m/s Twin B 2 m/s Identicaltwins, each with mass 57.3 kg, are onice skates and at rest on a frozen lake, which may be taken asfrictionless. Twin A is carrying a backpack of mass 12.0 kg. Shethrows it horizontally at 2.50 m/s toTwin B. Neglecting any gravity effects, what are the subsequentspeeds of Twin A and Twin B?
Twin A 1 m/s Twin B 2 m/s Twin A 1 m/s Twin B 2 m/s

Explanation / Answer

twin B: m3v3i = (m2+m3)vf vf = m3v3i/(m2+m3) = 0.433 m/s

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