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predkosc ciala.
m = 2 kg
Ek = 9 J
Ek = m*v² /2
2 Ek = m *v²
2 * Ek /m = v²
v = √(2 * Ek /m)
V = 3 m/s
2Ek = mV2
2Ek/m = V2
√2Ek/m = V
√2 * 9 J / 2kg = V
V = √9 m/s = 3m/s
Odp. Prędkość wynosi 3 m/s
Ek- 9J
Ek= mv² / 2 | *2
2Ek=mv² | :m
2Ek:m = v²
v=√2Ek:m
V=√(2 * 9 J) : 2kg
v=√18J:2kg
v=√9m/s
v=3m/s