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# Can someone help me with this MOMENTUM question? (A2 Physics) watch

1. I worked out momentum before is -220kgms-1 but it went downhill from there! (2nd picture attached is clear)
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2. (Original post by 3Kirchhoff)
I worked out momentum before is -220kgms-1 but it went downhill from there! (2nd picture attached is clear)
Sounds good so far, now use the fact that total momentum before = total momentum after and that the total kinetic energy is 115J to set up two equations to get the velocity. Remember that they move together so their masses will be combined.
3. Okay I gathered I could find the common velocity by using ke=1/2mv^2 which I formed an equation to be 115=1/2(110+m)v^2. I wonder if knowing that the opponent as twice the momentum helps us find the mass of the opponent? I'm really stuck. Do you bring potential energy into it?
4. (Original post by 3Kirchhoff)
Okay I gathered I could find the common velocity by using ke=1/2mv^2 which I formed an equation to be 115=1/2(110+m)v^2. I wonder if knowing that the opponent as twice the momentum helps us find the mass of the opponent? I'm really stuck. Do you bring potential energy into it?
to be fair it'd be an easy one to bottle in exam conditions...

hope that helps (stupid crappy camera)

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