Quick little question about energy conservation

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When analyzing an object shot at an angle, both components of velocity contribute to the total kinetic energy (KE). The formula for kinetic energy, KE = 0.5 mv^2, requires using the magnitude of the velocity vector, which includes both horizontal and vertical components. In conservation of energy calculations, the net velocity should be considered to accurately determine the kinetic energy. Therefore, for a ball shot at 32 degrees with an initial velocity of 74 m/s, the full magnitude of the velocity vector is essential. Understanding this principle is crucial for correctly applying energy conservation in projectile motion scenarios.
rygza
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When do i know which component of velocity to use when an object is shot at an angle?

For example: a ball of given mass is shot 32degrees above the ground with Vinitial of 74m/s. In using conservation of energy, K.E. = .5 mv^2 , which velocity component do i use?
 
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KE is a scalar. Use the magnitude of the velocity vector (i.e., both components contribute to the total KE).
 
in conservation of energy you take net velocity
 

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