Calculating Time for Javelin Throw Angle Change

AI Thread Summary
To determine the time required for the javelin's launch angle to decrease from 36 degrees to 18 degrees, one must first calculate the vertical component of the initial velocity using the launch speed of 29 m/s. The vertical speed can be derived from the initial speed and the angle, and then kinematic equations can be applied to find the time when this vertical speed corresponds to the new angle. The discussion highlights the need for guidance on applying these physics concepts, particularly in using kinematics to solve the problem. Participants express difficulty in starting the problem and seek direction on the calculations involved. Understanding the relationship between angle, velocity, and time is crucial for solving this javelin throw scenario.
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Homework Statement


In the javelin throw, the javelin is launched at a speed of 29m/s at an angle of 36degrees 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 to 18degrees?

Homework Equations


I can't find anything nor have we had any problems like this before.


The Attempt at a Solution


I'm sorry to say I can't even begin this problem. Anything that would point me in thr right direction would be great.
 
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Figure out the vertical speed from the initial speed and the angles. Then use the kinematics equations to find out when the vertical speed would decrease to the speed you calculated.
 

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