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E = 2000J
v= 20m/s =72 km / h
q= 10 m/s (przyciaganie ziemnskie)
szukane :
m = ?
Wzor
E= m * v * q
m = E / v* q
m = 2000 / 72 * 10
m = 2000 / 720
m= 200/72 = 2 56/72 kg
2 7/9 kg