Odpowiedzi

2009-10-21T12:11:19+02:00
S=So+at²/2
S=10m
a=10m/s²
10=10t²/2
20=10t²/10
2=t²/√
t=√2

v=at
v=10√2
1 1 1
2009-10-21T12:20:36+02:00
Dane:
Vp=0m/s
h=10 m
g=10 m/s²
___________
t=?
Vk=?

Epg=mgh
Ek= (mv²)÷2
Epg=Ek
mgh=(mv²)÷2
gh=(v²)÷2
v²=2gh
v=√2gh
v=√2×10×10
v=√200 m/s

t=√2h÷g
t=√2×10÷10
t=√20÷10
t=√2 s