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m = 50kg
v = 7,2km/h = 7,2×1000m/3600s = 2m/s
Szukane:
Ek = ?
Wzór:
Ek = m×v²/2
Ek = 50kg×(2m/s)²:2
Ek = 50kg×4m²/s²:2
Ek = 100J
Odp.: Energia kinetyczna chłopca wynosi 100J .