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s=at²:2 x2
2s=at²:a
2s:a=t²
t²=2x 300m : 3m/s²
t²=600m:3m/s²
t²=200 s²
t=√200s²
t=√4 x √50
t=2 x √2 x √25
t=2 x 5 x √2
t=10√2