Nvidia Corp NVDA.O tumbled 4.4%. By Devik Jain and Noel Randewich March 4 (Reuters) - Wall Street fell at the end of a volatile week on Friday as the war in Ukraine overshadowed an acceleration in U.S. jobs growth last month that pointed to strength in the economy. Federal Reserve Chair Jerome Powell said this week he would support a 25-basis-point interest rate increase at the central bank's March 15-16 policy meeting and would be "prepared to move more aggressively" later if inflation does not abate as fast as expected.