1. How fast would Velma have to fly across Chicago in order to observe the city's width to be reduced 10% below the width measured on the ground?

2. An elementary particle called a muon (negatively charged) decays into three elementary particles: an electron and an muon-flavored neutrino and an electron-flavored anti-neutrino with a lifetime of 2 microseconds. If they travel toward Earth from space at a speed of 0.5c what would be the lifetime measured by the scientists on Earth ?