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x = 5 m
g = 10 m/s²
vo = ?
x = vo² sin 2α x 1/g
5 = vo² sin (2x45) x 1/10
5 = vo² sin 90 x 1/10
5 = vo² x 1 x 1/10
50 = vo²
vo = √50
vo = 5√2 m/s