Réponse:
1. On a : Ec = (1/2)×m>v²
2. On a 360 km/h = 360÷3,6 = 100m/s
d'où :
Ec = (1/2)×760×100²
Ec = (1/2)×760×10000
Ec = 3750000 J
3. On a :
3750000 J = (1/2)×1400×v²
3750000 J = 700xv² 3750000/700 = v²
5357,142857 v²
D'où
v = √5357,142857
v = 73,19250547 m/s
Explications:
voici la réponse!