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Physics 13 Online
OpenStudy (anonymous):

In the javelin throw at a track-and-field event, the javelin is launched at a speed of 25.0 m/s at an angle of 38.0 ° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to be reduced from 38.0 ° at launch to 13.6 °?

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