I\'m having a few problems with my homework tonight, i\'ve taken a screenshot of

Question

I'm having a few problems with my homework tonight, i've taken a screenshot of a few questions. Thanks in advanced.
1. http://i.imgur.com/wHjUQ.png
2.http://i.imgur.com/pAVLU.png
3. http://i.imgur.com/CDadW.png

Explanation / Answer

1. P=F/A and the Pf=Pi so you have 100/.000001= F/.00002 --> F = 2000N 2. conservation of momentum, at the initial, the wagon velocity is 0. Pw = momentum of the wagon Pb= momentum of the brick Pf=Pi ---> Pw-Pb=0 --> 0 since v initial is 0 and subtracting since the brick is going the opposite of the wagon. Going west is negative, going east is postive. 30(v) - .5(25) = 0 --> v= 12.5/30= .42m/s East 3. Sorry couldnt understand :) but goodluck though!

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