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Two trains A and B simultaneously start ...

Two trains A and B simultaneously start moving along parallel tracks from a station along same direction. A starts with constant acceleration `2(m)/(s^2)` from rest, while B with the same acceleration but with initial velocity of 40 m/s. Twenty seconds after the start, passenger of A hears whistle of B. If frequency of whistle is 1194 Hz and velocity of sound in air is 322 m/s, calculate frequency observed by the passenger.

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