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I have done the following calculations already:

my average vertical jump is 27 inches and for calculations and 27 inches = .6858 meters and my desired vertical is 30 inches = .762 meters

so using the change in gravitational potential energy Eg=mgΔh (my mass is 67.1317kg)

Eg=(67.1317)(9.8)(.6858) and for my desired 30 inch vertical use (.762)m

Eg=451.18 J ^ which Eg=501.31 J

and with that if I wanted I could find out my take off speed by using the kinetic energy equation. But my main problem is what amount of force did I provide against the ground to get that speed.

finally once I have found the force could I use the equation Fg=mg and using the force calculated to jump that high could I find the mass if I were to squat or lift I would then be able to jump that high?

Thanks in advance for insight/comments