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This can be used when anyone needs to find the acceleration due to grav. When opposed by normal force equal to the objects weight in the y direction.

net force = normal force(call it n) - mg*sinA = 0

n = mg*sinA

n/m = g*sinA

this is the tricky part, because n is one farther in the alphabet than m, n/m simplifies to a

so a = g*sinA