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Car slams into truck and sticks to it

A car of mass m1 = 2000 kg moving at vi = 20 m/s slams into a stationary truck of mass m2 = 15,000 kg. Immediately after they collide, what is the speed with which the combined wreckage slides forward?

Which of the following is the final velocity vf?

  1. 20.0 m/s to the right
  2. 4.21 m/s to the right
  3. 2.67 m/s to the right
  4. 2.35 m/s to the right

Creative Commons License Copyright © Michael Richmond. This work is licensed under a Creative Commons License.