The Doppler effect determined and supported that the universe was expanding by measuring the Doppler effect in the light emitted from galaxies.
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The speed of the car at the bottom of the hill is obtained as, 
According the principle of conservation of energy, the total potential energy of the car will be converted to maximum kinetic energy when the car is at the bottom of the hill.

where;
- <em>v </em><em>is the speed of the car at the bottom of the hill</em>
- <em>h </em><em>is the height of the hill</em>
- <em>g </em><em>is acceleration due to gravity</em>
Thus, the speed of the car at the bottom of the hill is obtained as, 
Learn more about conservation mechanical energy here: brainly.com/question/332163
why did my answer get deleted??
oh yeah i put a link on there- oopsies.
I wont this time!
I got 30!
I believe that the answer is a.
Answer:
-A.
Explanation:
: Hope it's Help:
[correct me if I'm not correct]