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vs = -30 m/s
fs = 2000 Hz
vp = 0 m/s
v = 330 m/s
fp = ?
fp = fs × (v+vp)/(v+vs)
fp = 2000 × (330+0)/(330-30)
fp = 2000 × (330)/(300)
fp = 2000 × (110)/(100)
fp = 20 × 110
fp = 2200 Hz