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2E = mV²
m = 2E/V²
m = 2*10J/(2m/s)²
m = 20J/4m²/s²
m = 5kg
dane:
ek=10J
V= 2m/s
szukane
m=?
wzór:
Ek=m*v2/2 /:v2
Ek/v2=m/2 / *2
2Ek/v2=m
m= 2Ek/v2
[m]=J/m/s*m/s= kg
obliczenia:
m=10/2*2=2,5 kg
klocek ma masę 2,5 kg.