Posted by bill on Thursday, December 18, 2008 at 5:41pm.
These are all conservation of momentum problems, but easy because the cars stick together after the crash so the final mass is (2m)and they are both at the same final speed v
so
m u1 + m u2 = 2m v
or
u1 + u2 = 2v for all cases
for example for part b
u1 = 90
u2 = -120
so for part b
90 - 120 = 2 v
v = -15 answer for part b
You should be able to do parts a and c now.
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