Решение задачи по физике раздел 30 пункт 33 механика

33. Having reached the Earth´s surface there arose at the height h = 4 km unstable particle, which has its own lifetime τ = 4,5 ms and flying at a speed υ = 0,95s toward Earth?

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)