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July 2, 2015

Homework Help: physics

Posted by tom on Monday, September 29, 2008 at 1:51am.

A 68.0 kg boy and his 45.0 kg sister, both wearing roller blades face each other at rest. The girl pushes the boy hard, sending him backward with a velocity 3.70 m/s toward the west. Ignore friction.
How much chemical energy is converted into mechanical energy in the girl's muscles?
whenever i figure the answer i get 720 but htis is not right.

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