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Ep = 2 kg * 10 * 30 cm
Ep = 600 N
Ep=mgh
Ep=10[m/s²]*2[kg]*0.3[m]
Ep=6[N]
2.
Ek=mv²/2
Ek=za 3 sek
Ek=m(v+3[s])²/2
albo prościej v=s/t
t= 3 sek
h=s
s=?
h=gt²/2
h=45m=s
v=s/t
v1=45/3
v1=15[m/s]
v2=v1+3 sek
v2=18 sek
Ep=5[kg]*18²/2
Ep=810[j]