Answer:
37.42 m/s
Explanation:
We know that apparent frequency,
is given by
where f is the given frequency in this case 392, V is the speed of sound in air which is given as 343 and
is the speed of car which is unknown, \bar f is given as 440 Hz

Answer:
-3+3 i think this is the answer
Explanation:
i think you can ask someone else sorry
A particle smaller than an atom or a <span>cluster of such particles </span>
Potential energy = mass x gravity x height
P.E = 4 x 9.8 x 3
P.E = 117.6 J