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**Gravity Formulas urgent**

I have to find the gravity acting upon an object, given an ANGLE. What would be the simplest formulae to use, I forgot my wrk sheet at school. I just need the simplest formulae, i found some but these are hard for me, we didn't use these (I'm in grade 11);

http://upload.wikimedia.org/wikipedia/en/math/8/c/a/8cac81164940cc01c636c5c4d2592d48.png

http://upload.wikimedia.org/wikipedia/en/math/2/0/7/20746f41ac5995514c82e04f7e171b80.png