ex13.py

Created on March 18, 2026

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Question 3) Quelle sera la valeur 
de sa décélération si une fois 
lancée à 5 m.s−1 elle cesse tout
mouvement de propulsion ?

Ici, elle arrête de pousser. 
La seule force horizontale 
restante est la force de frottement 
dynamique qui va la freiner.

Équation de Newton : ΣF=m⋅a

Sur l'axe horizontal, il n'y a 
plus que le frottement dynamique
dirigé vers l'arrière (négatif) :
−Ffc =m⋅a.

Calcul de l'accélération (a) :
−29,43=60⋅a
a=−29,43 / 60
a=−0,49 m/s2

Conclusion pour l'examen : 
Elle subit une décélération 
de 0,49 m/s2 (ou 0,5 m/s2). 
L'accélération est négative 
car elle freine.

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ex13.py