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A thermally insulated vessel contains an...

A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats 1.4. Vessel is moving with speed v and is suddenly brought to rest. Assuming no heat is lost to the surrounding and vessel temperature of the gas increases by :
(R = universal gas constant)

A

`(Mv^(2))/(7R)`

B

`(Mv^(2))/(5R)`

C

`2(Mv^(2))/(7R)`

D

`7(Mv^(2))/(5R)`

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