A 20 kg girl is standing on a slippery ice with her 80kg dad. Both have very slippery shoes. She then pushes her dad away and finds herself sliding on ice at speed 4 m/s. At what speed is her dad sliding?
Conserve the moment here as there is no external force acting on the system
Initial momentum = 0
final = 20*4 + 80*v
hence 20*4 + 80*v = 0
v = -1 m/s
hence the girls dad moves in opposite direction with 1 m/s speed
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