Purpose of life is to explore and get experience. Another reason is to love and let what makes you happy guide you
Answer:
D
Explanation:
Cause im smart smart and the atom is very simple just use google lol
Answer:
68.6 m/s
Explanation:
v = Speed of sound in air = 343 m/s
u = Speed of train
= Actual frequency
From the Doppler effect we have the observed frequency as
When the train is approaching

When the train is receeding

Dividing the above equations we have

The speed of the train is 68.6 m/s