# Physical Science

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A boy throws a 4-kg pumpkin at 8 m/s to a 40-kg girl on roller skates, who catches it. At what speed does the girl then move backward?

• Physical Science -

you have to use conservation of momentum, and conservation of energy on this. Remember the boy moves after he throws it also.

• Physical Science -

I don't understand how to work it?

• Physical Science -

Is it .8 m/s

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