In the video above, my brother demonstrates acceleration through a pull up. While hanging from a bar, he lets gravity pull his entire weight 9.8 m/s2 down. At the start of a pull up, he uses his strength to accelerate upward until his chin is above the bar. As he gets closer and closer to the top of the bar, his acceleration from start to finish would resemble an upside down parabola shape in a v/t or a velocity versus time graph. Speed and acceleration is how this world functions and without it, I don’t know what it would have turned out to be.
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