We have that the see-saw will be balance if a weight of
is added to Nural's side of the see-saw

From the Question we are told that
Wan’s mass is 
Nurul’s mass is 
Generally
The Will be balance when the weight on both sides of the see-saw are equal




In conclusion
The see-saw will be balance if a weight of
is added to Nural's side of the see-saw

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Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. Stars start their lives as clouds of dust and gas.
The earth is revolving around the sun and when the seasons change the earth tilts at a different angle and it changes your perspective on the constellations<span />
Answer:
<h2>0.5 kg</h2>
Explanation:
The mass of the object can be found by using the formula

f is the force
a is the acceleration
From the question we have

We have the final answer as
<h3>0.5 kg</h3>
Hope this helps you
He used the quantum mechanic theory to approach light by describing relativity and perspective.