(EFOMM 2020) Efeito Doppler numa brincadeira de balanço entre duas meninas

Ana is playing on a swing while holding a tuning fork vibrating at 520 Hz. The highest point of her pendulum trajectory is 1.25 meters above the lowest point. Meanwhile, Beatriz, of similar height to Ana and located at a distant point ahead of the swing, runs towards her friend at a constant speed of 2 m/s. Assuming that Ana's oscillatory motion occurs without energy loss, what value is closest to the highest frequency that Beatriz will hear during her trajectory? Consider g = 10 m/s² and v_sound = 343 m/s. #ita #ime #efomm