Odpowiedź :
Odpowiedź:
1
m =50kg
Ek = 100 J
V = ?
Ek = (mV²)/2
2Ek = mV²
V = √2Ek/√m = 2 m/s
2
h = 10m
Ep = 500J
g = 10m/s²
m = ?
Ep = mgh
m = Ep/gh = 5kg
3
V = 30m/s
Ek = 180 kJ = 180 000 J
m =?
Ek = (mV²2)/2
2Ek = mV²
m = 2Ek/V² = 200 kg
Wyjaśnienie