There aren't any cents with a V on the back, only nickels. They're called Liberty nickels.
You need to know its date and condition. Either post a new question with that information or check the site linked below for approximate values.
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The "V" is the Roman numeral 5, the coin is a 1909 Liberty Head Nickel that is common with a value of $1.00-$3.00 in average condition.
V is the Roman numeral for 5, so it's a 1902 Liberty Head Nickel and value is $1.00-$3.00 for most circulated coins.
It is worth 1¢.
50 cent
It is not a "V" cent, but rather is known as a "V" or "Liberty Head" nickel. Like all US nickels, it is struck from 75% copper and 25% nickel.