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P=3000W
F=3000N
s=10m
Szukane:
t=?
P=W/t W=F*s
więc
P=F*s/t
t=F*s/P
t=3000N*10m/3000W=30J/3J/s=10s
2)P=5000W
s=5m
t=5s
F=?
F=P*t/s
F=5000W*5m/5s=5000N=5kN
3)
m=2000kg
g=10m/s²
F=m*g
F=2000kg*10m/s²=20 000N
s=1,5m
P=5W
t=?
t=F*s/P
t=20 000N*1,5m/5W=30 000J/5W=6 000s
4) m=15kg
g=10m/s²
F=m*g
F=15kg*10m/s²=150N
s=9m
W=?
W=F*s
W=150N*9m=1350J=1,35kJ