2. Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed. The ratio of the kinetic energy of Y to that of X is: A. 1:1 B.
Physique/Chimie
cyusayannick
Question
2. Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed. The ratio of the kinetic energy of Y to that of X is:
A. 1:1
B. 2:1
C. 4:1
D. 9:1
E. 1500:1
A. 1:1
B. 2:1
C. 4:1
D. 9:1
E. 1500:1
1 Réponse
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1. Réponse croisierfamily
Réponse :
Explications :
■ Ec = masse x vitesse² ♥
■ Ec1 = 500 x v² ; Ec2 = 2000 x v²
■ Ec2 / Ec1 = 2000/500 = 4 .