physics

A acorn falls from a tree and hits the ground with a speed of 10 m/s:
- From what height did the acorn fall?
- How long was the acorn in the air?

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asked by Jamika
  1. If the acorn fell from rest,
    equate energies
    mgh=(1/2)mv²

    h=v²/2g
    =100/(2*9.8)
    =5.1 m

    Time
    =v/g
    =10/9.8
    =1.02 s

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    posted by MathMate
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