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Initial State: An 8-month old child is at rest at the bottom of a staircase.
Final State: The child is at rest at the top of the staircase.
Notes The system includes the child and earth. The child uses the steps to slowly crawl up the stairs.

Initial State An 8month Old Child Is At Rest At The Bottom Of A Staircase Final State The Child Is At Rest At The Top Of The Staircase Notes The System Includes class=

Answer :

Answer:

9 years old and he/she crawl like at 2 years old