Respuestas

2011-12-06T16:23:33+01:00

v1 = 2 m/s

v2 = 8 m/s

 

Buscamos:

Ek2/Ek1 = ?

 

Ek = mv^2 /2

 

Ek2/Ek1 = mv2^2 /2 : mv1^2 /2

Ek2/Ek1 = m/2 x (8m/s)^2 : m/2 x (2m/s)^2

Ek2/Ek1 = 16

Ek2 = 16Ek1

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Rta: La energia cinética ha aumentado 16 veces.