Homework Help: Physical Sciene

Posted by Diana on Tuesday, November 1, 2011 at 10:58am.

A cannon is fired horizontally from a top of a 15-m platform. What is the cannon balls horizontal speed when it hits the ground 250 m downrange?

Physical Sciene - drwls, Tuesday, November 1, 2011 at 11:10am
The time (t) that it takes to hit the ground is determined by the height above ground. For horizontal firing,
t = sqrt(2H/g) = 1.749 s

The horizontal speed must be (at all times)
250/1.749 = 143 m/s

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