Alenex is driving 100 mph. Starting at 10:15 am and then slowed down to 55 mph by 10:17 am.
What was his acceleration?

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.