B. The sound of the engine will get louder and the pitch higher.
Answer:
The existance of dark energy was suggested to help explain measurements, using Type Ia supernovae as distance indicators, that the expansion of the universe is speeding up and its acceleration requires a source of energy. Scientists suggested that It may be a new form of energy for which there is not yet a theoretical explanation. quantum mechanics predict that it may be the vacuum energy associated with "empty" space itself.
Answer:

Explanation:
Distance travelled = 200 metre
Time taken = 24 second
Velocity = ?
<u>Finding </u><u>the</u><u> </u><u>velocity</u><u> </u>



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A persons or animals nature, especially as it permanently affects their behavior
The middle one on the list is the correct one.
The first one ... distance divided by time ... is Speed, not force.
The third one ... mass times velocity ... is Momentum, not force.