Identical twins, each with mass 66.0 kg, are on ice skates and at rest on a froz

Question

Identical twins, each with mass 66.0 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 3.20 m/s to Twin B. Neglecting any gravity effects, what are the subsequent speeds of Twin A and Twin B?
Twin A =______ m/s
Twin B =______ m/s

Explanation / Answer

Pbag = 12*3 = 36 PA=36=mA*VA ---->VA= 36/55 = -0.6545 m/s PB=36=(mB+mbag)*VB ---->VB = 36/(55+12) = 0.5373 m/s Conservation of momentum: PA = 55*-0.6545 = -36 kg-m/s PB = (55+12)*0.5373 = 36 kg-m/s PA+PB=zero

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