Final answer:
Some new weapons used at Passchendaele were Artillery, Machine Guns, and Flamethrowers.
Step-by-step explanation:
At the Battle of Passchendaele, also known as the Third Battle of Ypres, several new weapons were used. One example is the use of Artillery which became a key tool in the war. The German arms manufacturer Krupp unveiled the Big Bertha, a 420-mm howitzer, which was used extensively. Another notable weapon used at Passchendaele was the Machine Gun. These guns could fire hundreds of rounds per minute and caused mass casualties on the battlefield. Additionally, Germany introduced the use of Flamethrowers to force enemy soldiers out of their trenches.