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Basic: Solving freefall problems

Problem

A squirrel drops an acorn onto the head of a dog. The acorn falls 4.0m before it lands on the dog. We can ignore air resistance.
How many seconds did the acorn fall?
Round the answer to one decimal place (For example: 2.67 becomes 2.7).
Answer using a coordinate system where upward is positive.
  • Your answer should be
  • an exact decimal, like 0.75
s