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Using the general gravitational potential energy function (U = -GmM/r) as a guide, how much work must be done by an external agent to bring

Using the general gravitational potential energy function (U = -GmM/r) as a guide, how much work must be done by an external agent to bring the masses m and M from infinite separation to a separation of x/2?

  1. GmM/(2x)
  2. -Gm
  3. 2GmM/x
  4. -2GmM/x

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