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Cars I and II, having masses m and 2m re...

Cars I and II, having masses m and 2m respectively, are moving with velocities
2v and v respectively. They are brought to rest by the application of breaks. The cars take the same time and cover the same distance before coming to rest.
What is the ratio of change in kinetic energy of car I to that of car II ?

A

`1 : 2`

B

`2 : 1`

C

`1 : 4`

D

`4 : 1`

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