A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 145 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?

Answer 1

If you are "marco", you clearly need a tutor full time. H means height, g is a very universal symbol for the acceleration due to gravity.
http://www.jiskha.com/search/index.cgi?query=A+cannon+is+fired+horizontally+from+atop+a+40.0+m+tower.+The+cannonball+travels+145+m+horizontally+before+it+strikes+the+ground.+With+what+velocity+did+the+ball+leave+the+muzzle%3F+

Answer 2

This looks like a question I answered last week.
http://www.jiskha.com/display.cgi?id=1292888446

Answer 3

A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 145 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?