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The geometry of the problem does not seem well-described here. Assuming the spotlight beam and the observation are in the same vertical plane, there are two possibilities for the height:
.. 446 m . . . . . spotlight is aimed toward observer
.. 772 m . . . . . spotlight is aimed away from observer
See the attachment for the geometry. Choose the answer corresponding to the geometry of the problem.
.. 446 m . . . . . spotlight is aimed toward observer
.. 772 m . . . . . spotlight is aimed away from observer
See the attachment for the geometry. Choose the answer corresponding to the geometry of the problem.