The Helpers and the staff of the forum have agreed that they won't give a full answer to a problem posted with no attempt (except maybe in some cases). The Helpers are here to help you to understand your weaknesses by going through the asked questions with you and not here to solve your physics problems.
It is imperative to show an attempt to a problem. If you don't know how to start, say it. Helpers will give you a push in the right direction.

Welcome to the world of physics!

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Isaac
If the problem is too hard just let the Universe solve it.