physics

A subcompact car, mass 1,000 kg, runs into and sticks to an at rest, 2,200 kg SUV. If their final speed is 4.7m/s ,what was the smaller cars initial speed?
a) 67 m/s
b) 30m/s
c) 2.2 m/s
d) 15 m/s

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asked by katie
  1. final momentum = 4.7 (1000+2200)=15040

    initial momentum = 1000 v
    so
    v = 15.04 m/s

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    posted by Damon
  2. 15 m/s

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    posted by Joe

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