Answer:
The moon does not stay at the same distance of the earth because the ortbit of the moon is slightly elliptical. If earth is not tilted at an angle of 66.5°, there will be no change in the season and the earth will have equal length of days and night.
Explanation:
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When Object is at zero height, and there is no potential energy possess by the object then it exerts Greatest Kinetic energy in it's whole Journey
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Answer:
The frequency of the second wave is half of the frequency of first one.
Explanation:
The wavelength of the second wave is double is the first wave.
As we know that the frequency is inversely proportional to the wavelength of the velocity is same.
velocity = frequency x wavelength
So, the ratio of frequency of second wave to the first wave is

The frequency of the second wave is half of the frequency of first one.
<h2><em><u>Answ</u></em><em><u>er</u></em><em><u>:</u></em><em><u>-</u></em></h2>
The acceleration of the wheelchair is 
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<h3>• <u>Given</u><u>:</u><u>-</u></h3>
- Initial velocity of the wheelchair = 0 m/s
- Final velocity of the wheelchair = 1.5 m/s
- Distance covered by the wheelchair = 2 m
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<h3>
• <u>To</u><u> </u><u>Find</u><u>:</u><u>-</u></h3>
- Acceleration of the wheelchair = ?
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<h3>• <u>Solution</u><u>:</u><u>-</u></h3>
We know,
• <u>Third</u><u> </u><u>Eq</u><u>uation</u><u> of</u><u> Motion</u><u>:</u><u>-</u>

where,
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• <u>S</u><u>u</u><u>b</u><u>s</u><u>t</u><u>i</u><u>t</u><u>u</u><u>t</u><u>i</u><u>n</u><u>g</u><u> </u><u>the</u><u> </u><u>values</u><u> </u><u>in</u><u> </u><u>th</u><u>e</u><u> </u><u>Formula</u><u>:</u><u>-</u>
➪ 
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
➪ 
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
➪ 
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
➪ 
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
★ 
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
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Therefore, the acceleration of the wheelchair is 0.5625 m/s².
The mechanical advantage is (4meters) / (0.8meter) = <em><u>5</u></em> .