Physics Practice Problems Push-Away Problems With Energy Practice Problems Solution: A 65.0-kg boy and his 40.0-kg sister, both wearing...

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Solution: A 65.0-kg boy and his 40.0-kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backward with velocity 2.90 m/s toward the west. Ignore friction.(a) Describe the subsequent motion of the girl.(b) How much potential energy in the girl’s body is converted into mechanical energy of the boy–girl system?

Problem

A 65.0-kg boy and his 40.0-kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backward with velocity 2.90 m/s toward the west. Ignore friction.
(a) Describe the subsequent motion of the girl.
(b) How much potential energy in the girl’s body is converted into mechanical energy of the boy–girl system?