Question

Identical twins, each with mass 56.2 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 3.50 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

Answer 1

Try using the law of conservation of linear momentum, twice. First after the backpack is thrown, and again after it is caught. Show your work if you need further help.

Answer 2

0.25