Odpowiedzi

Najlepsza Odpowiedź!
2009-11-23T18:17:50+01:00
Zadanie 1
dane:
Vp=2m/s
Vk=7m/s
t=5s
a=? a=Vk-Vp/t a=7m/s-2m/s /5s a=5m/s / 5s =1m/s²
s=?
-----------------------
s=? s=at²/2 s=at²/2 | *2 2s=at² | :2 s=at²/2
s=1m/s * (5s)² /2 = 1m/s * 25s /2 = 25 /2 = 12,5 m
zadanie2
Vp=0m/s
Vk=?
a=3m/s²
a=Vk-Vp
a+Vp=Vk
Vk=a+Vp
Vk=3m/s²-0 m/s=3m/s
t=10s
--------------------
s=? s=at²/2 s=3m/s² * (10s)² /2 = 3m/s² * 100s/2 =300/2=150m

zadanie3
Vp=3m/s
Vk=18m/s
a=1,5 m/s²
t=? a=Vk-Vp/t a=Vk-Vp/t |*t t*a=Vk-Vp |:a t=Vk-Vp/a
t=18m/s - 3m/s /1,5 = 10s
--------------------------------------------
s=? s=at²/2 s=1,5 m/s² * (10s)² /2 =1,5 m/s² * 100s/2=
=150 /2 =75 m
1 5 1