Calculations for launching angle of 45. We can calculate free fall time by two steps: ? -? ? 1 = 0 ?/? -?i?(45)x3.914 ?/? ?? = 0. 28 ?. a -9.81 ?/? 2 H =? +? + ?a? i? za ?2 = 1.05? + ??(45) x 3. 914 ?/? x 0. 28? + (- 9. 81?/? 2)(0. 28?) 2 = 1. 44? 2x(? -? ) ? = 2x(0?-1.44?) 0. 54 ?. ? ? ? ? a -9.81 ?/? 2 = ? + ? = 0. 28 + 0.54 = 0. 82?. ???a; ?? ???? The calculated launching distance can be defined by next equation: ? = ? x ? = ???(45) x 3. 914 ?/? x 0. 82 ? = 2.27 ? % E???? = 2.300-2.27 x 100% = 1.32% 2.27