Homework Help: Physics

Posted by Sam on Friday, September 26, 2008 at 8:59pm.

a) A cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 100 m above ground level, and the ball is fired with initial horizontal speed v_0. Assume acceleration due to gravity to be g = 9.80 m/s^2. Assume that the cannon is fired at time t = 0 and that the cannonball hits the ground at time tg. What is the y position of the cannonball at the time tg/2?

I got 75m and I know that one is right.

I need help with part b
Given that the projectile lands at a distance = 110 from the cliff, as shown in the figure, find the initial speed of the projectile, .

Physics - bobpursley, Friday, September 26, 2008 at 9:05pm
If you found tg, the time in the air, then

110=horizontalvelocity*tg
- Physics - Sam, Friday, September 26, 2008 at 9:13pm
  I found tg to be 4.5. Is it 24.44
Physics - bobpursley, Friday, September 26, 2008 at 9:17pm
yes, watch the significant digits.
Physics - osama, Friday, November 11, 2011 at 8:34pm
alalalalalalaaaaaa
Physics - jorge, Thursday, January 26, 2012 at 4:15pm
idk

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