Answer :
The person's work is positive, with a rating of 52.92 J.
Gravity's work is negative, with a value of -52.92 J.
define distance ?
Distance is a numerical or sometimes qualitative measurement of the distance between objects or points. In physics or everyday use, distance can refer to physical length or estimate based on other criteria (e.g. "two particles above"). Since spatial perception is a rich source of conceptual metaphors in human thought, the term is also often used metaphorically to refer to a measure of the degree of difference between two similar objects ( such as the statistical distance between probability distributions or the distance between text strings) or the degree of separation (as illustrated by the distance between people in a social network). Most concepts of distance, both physical and metaphorical, are formalized in mathematics using the concept of metric space.
m = 4.5 kg is the mass of a cement block.
The block raises the vertical distance by d=1.2m.
d' = 7.3 m is the horizontal distance covered by the block.
Since the person raises the block, there is some displacement of the block. As a result, the individual will accomplish good job. And the person's work is saved in the form of block potential energy.
w=mgd
=4.5x9.8x1.2
=52.92 J
As the gravity will oppose the block's motion, thus it will produce negative work on the block. Therefore,
Gravity's work = - (Work done by person)
Gravity work = - 52.92 J
Thus, gravity's work is -52.92 J.
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