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Unformatted text preview: (70 kg)(2.0 m/s) (20 kg) 7.0 m/s i f A A B B A A B B B B p p m v m v m v v m v v = + = = ! = ! = ! d) If they are wearing regular shoes, they will experience a frictional force between their shoes and the floor. This means that the momentum of the father-daughter system does not have to be conserved. In the first scenario, the father could use the friction between his shoes and the floor to push off against his daughter, in which case he may not even move backward. In the second scenario, they could use their shoes to stop themselves from moving, so the initial velocity of the daughter could be anything....
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