Question

WITAM!

Załączam zdjęcie 5 zadań z fizyki:

Proszę o dokładne rozwiązanie.

Daję NAJJ!

z góry thx

Answer 1

zad1.

  vp = ?

a = 5m/s^2

t = 3s

vk = 21 m/s

 

vk = vp + at

21 = vp + 18

21 - 18 = vp

vp = 3m/s

 

 zad2.

a = 8m/s^2

vp = ?

t = 10s

s = 450m

 

s = vp x t + at^2/2

450 = 10vp + 8 x 100/2

450 = 10vp + 400

450 - 400 = 10vp

50 = 10vp /10

vp = 5m/s

 

zad 3.

a1 = 0.5 m/s^2

a2 = 1.5m/s^2

s1 = ?

s2 = ?

t = 4s

 

s = at^2/2

s1 = 0.5 x 16/2

s1 = 4m

 

s2 = 1.5 x 16/2

s2 = 24/2

s2 = 12m

 

zad4.

 

g = 10m/s^2

h = 20m

vk = ?

t = ?

 

h = gt^2/2

20 = 10t^2/2

20 = 5t^2 /5

4 = t^2

t = 2s

 

vk = a x t

vk = 10 x 2

vk = 20m/s

 

5 niewiem jak zrobic ..