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September 23, 2014

September 23, 2014

Posted by **Li** on Sunday, February 22, 2009 at 8:55pm.

After what interval does the ball hit the tree?

At what height above the ground will the snowball hit the tree?

Determine the snowball's velocity as it strikes the tree.

I was able to figure out that the time is .5s and the height is .3m; according to the back of the book, these are correct. I can't figure out the last answer, though. Can someon eplease help?

- Physics -
**Chopsticks**, Sunday, February 22, 2009 at 9:48pmWell, if you found the answer to the first and second question, you should be able to figure that out via the kinematics equations esp if you got the height question

- Physics -
**Eddie**, Sunday, February 22, 2009 at 10:07pmthat's the problem, I can't....

- Physics -
**drwls**, Monday, February 23, 2009 at 9:29amUse conservation of energy. The kinetic energy when it hits the tree will be

(1/2) M V2^2 = (1/2) M V1^2 + M g H

where h is the 1.2 m distance that it falls vertically and V1 is the initial velocity of 18 m/s. The M's cancel. Solve for V2

V2^2 = V1^2 + 2 g H

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