The coin does not weigh an ounce to start with so it can't have any ounces in it.
The 1964 Kennedy half dollar, which is 90% silver, contains 0.3617 troy ounces of silver. The 1965-1970 Kennedy half dollars (as well as some 1976 coins issued for collectors), which are only 40% silver, contain 0.1479 troy ounces of silver. The silver proof Kennedy half dollars produced for collectors since 1992 are, like the 1964 coins, 90% silver and contain 0.3617 troy ounces of silver.
The 1964 Kennedy half dollar contain 11.25 grams of silver. Kennedy half dollars from 1965 through 1970 contain 4.60 grams of silver.
The 1964 Kennedy half has .36169oz of pure silver in it.
1964 was the only year JFK halves were made of 90% silver alloy. The composition was changed to 40% silver clad in 1965, and to copper-nickel clad in 1971. A 1964 Kennedy Half Dollar contains .3617 ounces of pure silver. Multiply this by the spot price of silver to get the bullion value of the coin. At the time of this writing, silver was $16 an ounce, making a 1964 Kennedy Half Dollar worth about $5.80
1964, the year after Kennedy was assassinated.
You don't.
Yes, since 1964
Try again. The Kennedy half dollar wasn't introduced until 1964.
Check that coin again. Kennedy wasn't put on the half dollar until 1964.
40.00
Hammer and sickle
No 1963 Kennedy half dollars exist. 1963 is the last year of the Franklin half dollar. 1964 is the first year for Kennedy.