7. You are trying to catch the mailman so you can give him a letter. You start running after him and catch him going 6 m/s. If your acceleration is 0.5 m/s/s, how long does it take you to catch him?
How long does it take to catch the mailman

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?