# 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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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
2. 69

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