Posted by eileen on Saturday, December 1, 2012 at 7:49pm.
initial momentum = 1000*2.5 + 2500 * v = final momentum = 0
v = - 2500/2500 = -1 m/s
Use momentum conservation and assume the cars stick together.
1000*2.5 - (2500)*V = 0
V = 1.0 m/s
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