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How do I solve this? I need this done asap

How do I solve this? I need this done asap-example-1

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In an uniform gravitational field the center of gravity is equal to center of mass of a mass distribution. The center of mass of a colinear discrete mass distribution is given by:


x_(cm)=(1)/(M)\sum ^N_(i\mathop=1)m_ix_i

where M is the total mass of the system, m_i the mass of each particle and xi is its position. In this case we have:


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User Bram Schoenmakers
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