Answered

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​

Sagot :

croisierfamily

Réponse :

Explications :

■ Ec = masse x vitesse² ♥

■ Ec1 = 500 x v² ; Ec2 = 2000 x v²

■ Ec2 / Ec1 = 2000/500 = 4 .