Answer on Mechanics | Relativity Question for andi
T = Tf + Ts,
where T is the total time elapsed from the moment of dropping the watermelon to the moment of hearing the splat (T = 2.5 s), Tf is the flight time of the lemon and Ts is the sound flight time. Let H be the height of a building. Then
H = g·Tf²/2 ==> Tf = √(2H/g)
Ts = H / Vs,
where Vs is the speed of the sound (Vs = 340 m/s).
& radic;(2H/g) + H/Vs = T,
H/Vs + √H·√(2/g) - T = 0.
We've got a quadratic equation.
& radic;H = ( -√(2/g) ± √(2/g + 4T/Vs) ) · Vs/2 =
= ( -√(2/9.8) ± √(2/9.8 + 4·2.5/340) ) · 340/2 = 5.3478 or -158.9441.
So, the height of a building is H = 5.3478² = 28.5989 m.
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