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Answer to Question #68253 in Optics for abdul

Question #68253
An athlete in the javelin event runs along a horizontal track and launches the javelin at an angle of 40* to the horizontal. The javelin rises to a maximum height and then falls to the ground level. It hits the ground 4.00 s after launching, at a point a horizontal distance of 75.2 m from the launch point.
(i) Show the horizontal component of the launch is 18.8 m/s.
(ii) Calculate the magnitude of the launch velocity.
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