Consider the head-on collision between a water molecule, mass18u and a nitrogen molecule mass 28u. Prior to the collision, thenitrogen moving to the right at +0.4390 km/s and the water moleculeis moving to the left at -0.7570 km/s. Immediately after thecollision, the velocity of the water molecule is v = 0.6990 km/s. Apositive sign indicates a molecule moving to the right and anegative sign indicates a molecule moving to the left. The atomicmass unit (u) is commonly used to indicate the mass of atoms andmolecules: 1u=1.66×10-27kg.
What is the velocity of the nitrogen molecule immediately after thecollision? (in m/s)
| A: -0.3976 | B: -0.4970 | C: -0.6212 | D: -0.7766 | E: -0.9707 | F: -1.2134 | G: -1.5167 | H: -1.8959 |
If the collsion described above is an elasticcollision, which of the following MUSTconserved?
I. Momentum
II. Kinetic Energy
| A | I only |
| B | Neither I nor II |
| C | Both I and II |
| D | II only |
