A 56.0 kg boy and his 45.0 kg sister, both wearing rollerblades face each other

Question

A 56.0 kg boy and his 45.0 kg sister, both wearing rollerblades face each other at restpushes the boy hard, sending himbackward with a velocity 3.20 m/s toward the west. Ignore friction.How much chemical energy is converted into mechanical energy in thegirl's muscles?
___________ J
note- incorrect answers i have already tried include: 786 and 356.8 and 287 and 230.4 A 56.0 kg boy and his 45.0 kg sister, both wearing rollerblades face each other at restpushes the boy hard, sending himbackward with a velocity 3.20 m/s toward the west. Ignore friction.How much chemical energy is converted into mechanical energy in thegirl's muscles?
___________ J
note- incorrect answers i have already tried include: 786 and 356.8 and 287 and 230.4

Explanation / Answer

The chemical energy which is converted into mechanical energyin the girl's muscles is
E = (1/2)mv2 where m is the mass of the girl and v = 3.20 m/s where m is the mass of the girl and v = 3.20 m/s

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