Ah I see. hah
This is the part where I'm having a bit of trouble with right now. How would I end up with a +4 in momentum? Conceptually, it makes sense, but mathematically, I'm not sure how a +4 would come up, other than saying Emil and Kerry's momentum switched (mvEmil=-0.5 and mvK=4.5 on the...
Yes. Although instead of dividing by 130, I divided by 131.5 kg, which comes from adding the weight of the balls on the cart.
Hmm. I'm lost a bit now. So the velocity of the cart after the balls are caught is zero then? I'm not completely sure how you're getting -4/130*130+4...
Yes, I think it should be only one cart rather than two. Simon's answer scared me for a moment until I realized how he worked through it.
So then, I'd get something like -mcvc*air+mEBvEB-mKBvKB=mc,KB,EBvfinal, where vEB is still 4.5 m/s and vKB is 1.0 m/s and the negative means going...
Homework Statement
Emil and Kerry are standing on a stationary cart with frictionless wheels. Total mass of cart and riders is 130 kg. At the same instant, Emil throws a 1.0 kg ball at 4.5 m/s to Kerry while Kerry throws a 0.5 kg ball to Emil at 1.0 m/s. Emil's throw is to the right and...