1. The problem statement, all variables and given/known data A jet fighter in level flight passes directly overhead at a speed corresponding to Mach number 1.29. The sonic boom is heard by you on the ground 11.9 s later. What is the altitude of the plane? Assume (unrealistically) the speed of sound does not change with altitude. 2. Relevant equations Mach = vsource / vsound 3. The attempt at a solution M = vsource / vsound 1.29 = vsource / 343 vsource = 442.47 m/s d = vt d = (442.47 m/s)(11.9 s) d = 5265.393m = 5.265 km the answer above was wrong, any help is appreciated!