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solve v0*t-0.5*9.81*t**2=2000, m*9.81*2000=m*0.5*(v0-9.81*t)**2 for v0
solve v0*t-0.5*9.81*t**2=2000, m*9.81*2000=m*0.5*(v0-9.81*t)**2 for v0
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