You first have to determine whether it's silver or just silver-colored. Please see the Related Question for more information.
Kennedy is on the HALF dollar, not dollar. There were no U.S. silver dollars minted in the 1960s. The '64 Kennedy half is 90% silver and extremely common, currently worth about $10.50 for the silver.
A 1969 silver Kennedy half dollar is worth $5 inn perfect condition. The value of the silver is worth $2.87.
A 1776-1976 no proof quarter dollar worth in 2012
If you mean a 1998 Kennedy half dollar, the coin has no silver in it and is worth face value.
The 1966 Kennedy half dollar is 40% silver and worth about $5.00.
As of February 2018, it's worth about $2.50 for the silver.
If the coin is a US Kennedy half dollar dated 1974 it has no silver in it and is face value.
The 1998-S silver matte finish Kennedy half dollar with the letter p is worth $500
1965-1970 Kennedy halves are only 40% silver. Most are valued for just the silver, about $4.50.
It's worth about $4 for its silver content.
The coin is only 40% silver and has a value of $2.73 only the 1964 Kennedy half dollar was 90% silver.
A 1972 Kennedy half dollar contains no silver and is worth 50 cents.