Projectile Velocity Calculation with Given Angle and Direction

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The discussion revolves around calculating the final velocity of an object launched at a specific angle. The object lands with a velocity of 12 m/s at 13 degrees below the horizontal, leading to confusion about the sign convention for the final velocity. The user attempts to express the final velocity in terms of its components, suggesting vf = -12 m/s cos(-13). Clarification is sought regarding the negative angle due to the downward direction of the launch. A diagram is recommended to aid in visualizing the problem and understanding the calculations.
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Homework Statement


An object is launched and it's velocity upon landing is 12 m/s [13 degrees below the horizontal].
If I assume down is positive and up is negative, what would my given for vf look like?


Homework Equations


in the x direction: vfcostheta
in the y direction: vfsintheta


The Attempt at a Solution


vf=-12m/s cos -13

Is it negative 13 b/c it's below the horizontal?
 
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Try to draw a diagram first. I don't really understand what your question is.
 

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