Two boys dropped sheets of paper from the top of the tower. One boy dropped his sheet of paper as such, while the other boy dropped it by changing it in the shape of a ball. Which sheet will reach the ground first? Explain why?(Assume air resistance negligible)

Since, there is negligible air resistance both the sheets will reach the ground at the same time. 

If there was air resistance then the sheet which has been folded into a ball will reach the ground first because then that sheet will have very less area and hence less resistance to its fall.

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The crumbled sheet of paper would reach the ground earlier as it's density is higher than the sheet as it is.
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THESE TWO SHEETS WILL REACH THE GROUND FIRST IN SAME  TIME.AS THERE IS NO AIR RESISTENT
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If you mean to instruct us to solve the problem by using air resistance, (though your question is clear, I never heard of this version of the question. I always heard about the one in which air resistance is considered).
Anything that flows is a fluid. Air is a fluid. Fluids also exhibit a frictional force known as drag.
Drag is dependent on the area in contact with the fluid ( in this case, air ).  
Paper, when crumbled, resembles a sphere.
The sphere comparatively has less surface area in contact with air when compared to the original paper sheet. So it will experience less drag and reach the ground first. The sheet however, has more area in contact with air. It will experience more drag and will reach the ground slower.

But the solution according to your question is:

if air resistence is negligible, both will reach the ground at the same time.
 
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