physical
posted by crystal .
what is the size and direction of the final velocity of the two cars when a 0.4 kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8 kg toy car that is traveling the opposite direction of 2 m/s

physical 
Damon
original momentum in x direction
= .4*3  .8*2
= 1.2 1.6
= 0.4 kg m/s
so moves to left if first car was moving right
final momentum in x direction = (1.2)v
final momentum = original momentum (first law)
1.2 v = 0.4
v =  1/3 meter/second
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