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zorro
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Homework Statement
A source S and a detector D are initially at a distance of x=1km. Both start moving towards one another with same acceleration a = 10m/s2. Frequency of source is f = 2000Hz. Find the frequency observed by the detector at time t=4s. Speed of sound in air is v=300m/s
The Attempt at a Solution
I found out the velocity of detector at the end of 4s as 40m/s.
f1 = f(v+vd/v-vs)
If we substitute vs as 40m/s, the answer comes wrong.
Any help appreciated.