In outer space a rock whose mass is 3 kg and whose velocity was 3900, −2900, 3000 m/s struck a rock with mass 13 kg
and velocity 220, −260, 300 m/s. After the collision, the 3 kg rock's velocity is 3500, −2300, 3500 m/s.
(a) What is the final velocity of the 13 kg rock?
(b) What is the change in the internal energy of the rocks?
(c) Which of the following statements about Q (transfer of energy into the system because of a temperature difference
between system and surroundings) are correct?
(A) Q ≈ 0 because the duration of the collision was very short.
(B) Q = ΔEthermal of the rocks.
(C) Q ≈ 0 because there are no significant objects in the surroundings.
(D) Q = ΔK of the rocks.