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Dec 31, 2015 at 20:31 comment added hobbs You missed the point of the question. It's not "will it come back down", it's "will it come back down in my hand" — and not, e.g. ten feet to the left.
Dec 31, 2015 at 19:16 comment added Sathyam The coin have the same velocity and angular acceleration at the instant of detachment from your hand. After deployment there is no longer a centripetal acceleration . There is a radial acceleration towards the center of the planet combined with a tangential velocity and the atmosphere does play a role in the form of a drag force.
Dec 31, 2015 at 19:10 history answered user98038 CC BY-SA 3.0