I believe it is called the "Lunar Crust" but not 100% sure.
distance of each pan from the center or fulcrum is given as

now if dishonest shopkeeper shifted it by 0.633 cm from center
so distance on each side is given as


now the weight is balance as


now we will have

now we can find the percentage change as


Answer:581.87 K
Explanation:
Given
Sphere is melted to form a square
Let the radius of sphere be r and square has a side a
Therefore

Surface area of sphere 
Surface area of cube 
Total emmisive remains same
Thus 







Using the 3rd equation of motion:
= v² - u² = 2gs ------ [g = Acceleration due to gravity]
= v² - 20² = 2 × 10 × 300
= v² - 400 = 6000
= v² = 6000 - 400
= v = √5600
= v = 74.83 m/s
And yeah it's done :)
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