2 a 40 kg boy and his 35 kg sister both wearing ice skates face each o
2. A 40 kg boy and his 35 kg sister, both wearing ice skates, face each other at rest on the ice rink. The girl pushes her brother, sending him backwards with a velocity of 1.8 m/s. What is the minimum amount of chemical energy that is transformed into mechanical energy in the girl's muscles?
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