Momentum = mass x velocity = 91x9 = 819 kg-m/s.
Beryl is shaped like the hexagonal crystal system
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I think it is kinetic friction not the best at physics
Answer:
Janna levin is a cosmologist and professor at physics.
She is an american by race
She was the presenter of Nova feature Black hole Apocalypse and has writtenany science non-fiction books
www.jannalevin.com is her own page where u get her correct info and bio
