td2ex2chutelibre.py

Created by math-pana72

Created on April 25, 2025

780 Bytes


Exercice 2.
Une plongeuse décolle de son 
plongeoir de 15 m avec une 
vitesse verticale initiale de 
10 m.s-1
1) A quelle hauteur sélève-t-elle ?
2) En combien de temps atteint-elle 
sa hauteur maximale?
3) Combien de temps sécoule 
entre le décollage et la 
pénétration dans leau ?


reponse

1) y=?  V=0
   y0=15m VO=10
   
y-y0=Vaucarre-V0aucarre/-2*G
y-15=0aucarre-10aucarre/-2*10
y=0-100/-20 +15=5+15=20m

2) -g=V-V0/t-t0   t0=0

-10=0-10/t-0
-10=-10/t
t=-10/-10=1s

3) y-y0=Vaucarre-V0aucarre/-2*g
y=0

0-20=Vaucarre-0aucarre/-2*10
-20=Vaucarre/-20
Vaucarre=20*-20
        =-400
V=-racinede400=-20m/s

y0=15m  y1=20m  y2=0
t0=0s   t1=1s   t2=?
V0=10m/s  V1=0  V2=-20

-g=V2-V1/t2-t1
-10=-20-0/t-1
-20=-10*(t-1)
   =-10t+10
-30=-10t
t=3s


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