Homework Help: Physical Science

Posted by Jason on Sunday, September 11, 2011 at 6:39pm.

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 - bobpursley, Sunday, September 11, 2011 at 7:23pm
you have to use conservation of momentum, and conservation of energy on this. Remember the boy moves after he throws it also.
Physical Science - Jason, Sunday, September 11, 2011 at 9:52pm
I dont understand how to work it?
Physical Science - Jason (please help), Sunday, September 11, 2011 at 10:23pm
Is it .8 m/s

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