Odpowiedzi

2009-10-13T21:30:45+02:00
Ek = mV² / 2
Ek*2 = mV²
m = Ek*2 / V²

dane:
Ek = 2kJ = 2000J
V = 10 m/s

obliczenia:
m = 2000 * 2 / 10² = 4000/100 kg = 40 kg
2009-10-13T22:02:08+02:00
V = 10 m/s
Ek = 2000J

Ek = mv^2 /2
2Ek = mv^2
m = 2Ek / v^2
m = 2 x 2000 / 10^2
m = 4000 / 100
m = 40 kg

Masa tego ciala to 40 kg