Answer:
A) Speed
Explanation:
The medium of transmission(air) does not change before and after reflection. The sound still travels in air after the reflection. i.e the medium of transmission of sound is constant.
Since the medium of transmission remains constant, speed also remains constant. Speed only changes when the medium of transmission changes.
Answer:
Acceleration of the train is -3 m/s²
Explanation:
Since it stops,
final velocity (v) = 0 m/s
time (t) = 25 seconds
initial velocity(u) = 75 m/s
Now,
accelereation = (v-u)/t
or, a = (0-75)/25
or, a = -75/25
so, a = -3 m/s²
Soy sauce is a homogeneous mixture.
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