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V₀= ?
t= 2s
e=100m
La formula: e=V₀t+1/2(at²)
100m=V₀2s+1/2(-10(m/s²)(2s)²)
100=2V₀ - (1/2)(10)(4)
100=2V₀ - 20
100+20=2V₀
2V₀ = 120m/s
V₀=60m/s