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z=v√2h/g- zasięg rzutu
v=z/√2h/g
v=z√g/2h
v=9m√10m/s²:4m
v=9m√2,5/s²
v≈14,2m/s
2.
h=gt²/2
h=10m/s²×225s²:2
h=1125m