Problem 99 Shooting Uphill

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David_Kolln     2017-04-20 14:59:00

For the example problem solution it states the following: 0 0 0 0 0 1 1 1 1 2 2 2 2 2 2 3 4 5 6 6 7 8 9 9 10 10 10 10 10 10 11 11 12 13 14 15 16 16 17 18 42 42 34 33 41 52 and the answer listed for the first shot (velocity = 42, angle = 42) is 96 (where bomb landed rounded down)

The actual answer according to hyperphysics "Will it clear the fence?" is approximately 97.18 meters.

Quick run down: At 92 meters the height is 40.26 meters and the wall is at 36 meters. At 96 meters the height is 40.08 meters and the wall is at 40 meters. At 97 meters the height is 40.01 meters and the wall is at 40 meters. At 98 meters the height is 39.93 meters and the wall is at 40 meters.

So between 97 and 98 is where we hit the wall.

So I'm running into problems with this one in that when you hit the top of the wall, the answers are not accurate. Hitting the side works, because the side is the side, divisible by 4. So not sure what to do with this one at the moment. Hoping someone can lend a hand.

Now I can get 96 if my increments are not at 1 meter lengths, but at the blocks. However that doesn't work either because in the example answer section you have 97 meters as one of the answers which is not rounding to the block, but to the meters on top of the block.

Thank you.

Quandray     2017-04-21 06:36:32
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Hi David,

Make sure you are using 9.81 for gravity. I can get your figures if I use 9.8.

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