# Centre Of Mass: Frame

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• May 20th 2008, 07:37 AM
Simplicity
Centre Of Mass: Frame
I don't understand how you would find the centre of mass of $CD$ from $AB$? Thanks in advance.
• May 20th 2008, 08:10 AM
TKHunny
Did you set it up on coordinate axes? I put the Origin in the lower left-hand corner.

Can you find the Center of Mass? (a,b) The x-coordinate would answer the question in the problem.

For the distance from CD, you need only the equation of CD which is simple enough (y-0) = (4/3)(x-4) or 4x - 3y - 16 = 0. This leads directly to the solution $\frac{|4(a)-3(b)-16|}{5}$.