In outer space, rock 1 whose mass is 5 kg and whose velocity was 3300, −3100, 3400 m/s struck rock 2, which was at
rest. After the collision, rock 1's velocity is 2800, −2400, 3700 m/s.
(a) What is the final momentum of rock 2?
(b) Before the collision, what was the kinetic energy of rock 1?
(c) Before the collision, what was the kinetic energy of rock 2?
(d) After the collision, what is the kinetic energy of rock 1?
(e) Suppose that the collision was elastic (that is, no change in kinetic energy and therefore no change in thermal or
other internal energy of the rocks). In that case, after the collision, what is the kinetic energy of rock 2?
(f) On the other hand, suppose that in the collision some of the kinetic energy is converted into thermal energy of the
two rocks, where ΔEthermal,1 + ΔEthermal,2 = 7.16 × 106 J. What is the final kinetic energy of rock 2?
(g) In this case (some of the kinetic energy being converted to thermal energy), what was the transfer of energy
Q(microscopic work) from the surroundings into the tworock system during the collision? (Remember that Q
represents energy transfer due to a temperature difference between a system and its surroundings.)