# Leonard and William

Pro Problems > Physics > Motion and Forces > Projectile Motion## Leonard and William

BONUS: What can we conclude about the height at which the ping pong balls were fired?

* 16## Solution

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The cannonball travels 80 yards before hitting the ground. At what speed is the cannonball traveling when it hits the ground?

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Because of union troubles at the North Pole, Santa has to cut corners in his operation. One of the ways he's cutting corners this year is as follows: at every house, he will swoop down to 0.5 meter above the top of each chimney, and just as he's passing over the edge of the roof, he will drop presents from his sleigh, so they will fall down the chimney.

This will save him the time and trouble of climbing down chimneys (plus, Mrs. Claus likes it because he doesn't have as much cookies and milk this way).

However, there is a problem with the new system. Everyone's chimney must be the same distance from the edge of the roof. If Santa's sleigh travels at 40### Roof Launch

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^{2}

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Sometimes Physics problems happen in the strangest of circumstances. This morning my wife and children went grocery shopping. One child sat in the seat in the back of the grocery cart, and the other sat in the cute little "toy car" at the front of the cart. Today a roaster chicken was being purchased. In the process of putting the bird in the cart, my wife fumbled it, and then fumbled it again, and after bouncing from one hand to the other, it launched outward, and went through the window of the toy car, to land in the passenger seat next to my son.

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