Oil is a lubricant which helps increase friction. when u spread sand on a place where oil is spilled the sand reduces friction between road and vehicle tire. the vehicle wont skid.
<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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➪ 
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➪ 
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➪ 
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★ 
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Therefore, the acceleration of the wheelchair is 0.5625 m/s².
The frequency of the photon emitted by a hydrogen atom is 
<h3>What are Photons?</h3>
A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
In the case of light, the frequency, symbolized by the Greek letter nu (ν), of any wave equals the speed of light, c, divided by the wavelength λ:
v = c/λ
Since the wavelength λ is in the bottom of the fraction, the frequency is inversely proportional to the wavelength.
v = c/λ
v= 
By using Rydberg's formula,
1/λ 
1/λ = 
λ = 
is frequency of the photon emitted by a hydrogen atom.
Learn more about Photons here:brainly.com/question/20912241
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Force = mass x acceleration
Mass is given to be 250kg
Acceleration is given to be 5m/s^2
Force = 250kg x 5m/s^2 = 1,250 kgm/s^2 = 1,250 Newtons