centigrams
The Filipino peso coin features the profiles of notable Filipino national heroes such as Jose Rizal on the 1 peso coin and Andres Bonifacio on the 5 peso coin. Other coins feature important symbols and landmarks in the Philippines.
50
The 1979 5 sentimos commemorative coin from the Philippines is part of the "Ang Bagong Lipunan" series, but it does not commemorate 1949. To determine its value, you can check online auction websites like eBay or consult with coin collectors and dealers who specialize in Philippine numismatics. The value of the coin will depend on its condition, rarity, and demand among collectors.
Newtons
The one peso coin is made of material that contains ferromagnetic elements, like iron, which are attracted to magnets. The five peso coin does not contain these elements, so it is not attracted to magnets.
500
1962 cinco centavos gold mexicanos
A 50 peso coin is essentially valueless, because the peso of 1984 was converted to a new peso currently in use, and older peso coins removed from circulation. A person who walks into a coin dealer in Mexico City can find these coins at low prices (one or two pesos, maybe 20 US cents) just because the artwork on the coin is of historical interest, but the occasional E-Bay posting of these coins with prices of $5 or $10 represents a huge markup on what is essentially a valueless (although pretty) coin.
It depends upon the "grade" of the coin (i.e., how much detail is left from when it was orginally stamped at the mint, whether it's "dinged" around the edges, etc...) and to whom you're selling it to! A badly worn 1948 5 peso coin is naturally not going to be worth much more than scrap silver prices, while a pristine MS-66 1948 5 peso coin with a "mint error" is going to be worth far more to a numismatic collector.
Nothing just like all things Mexican
There is no such thing as a "dollar peso". Mexico uses the "$" sign to mean peso, and they're 2 different currencies. Mexican currency was devalued in 1992 at the rate of 1000 old pesos to one new peso, so your coin is actually worth only 5 centavos at current rates. That's less than a penny.