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A. <span>Standing is health-enhancing because it uses energy.
Because standing can burn a lot of calories.</span>
Answer: A student walks 50 meters east, 40 meters north, 35 meters east, and then 20 m south. Then the magnitude and direction of the student's total displacement will be 87.32 m along the direction of AD or in east-south direction.
Explanation: To find the correct answer, we need to know about the Displacement of a body in motion.
<h3>What is displacement of a body in motion?</h3>
- The displacement is the shortest distance between initial and final positions of a body.
- It's a vector quantity, and can positive, negative, or zero.
- The magnitude of displacement is less than or equal to the distance travelled.
<h3>How to solve the problem?</h3>
- At first, we can draw a diagram showing the motion of the body.
- From the diagram, the displacement of the body will be equal to the distance between point A and D.
- To solve this, we can use Pythagoras theorem.
![AD=AC+CD\\AC^{2} =50^{2} +11^2\\AC=51.19 m\\Similarly,\\CD^2=35^2+9^2\\CD=36.13 m\\thus, \\AD=51.19+36.13=87.32 m](https://tex.z-dn.net/?f=AD%3DAC%2BCD%5C%5CAC%5E%7B2%7D%20%3D50%5E%7B2%7D%20%2B11%5E2%5C%5CAC%3D51.19%20m%5C%5CSimilarly%2C%5C%5CCD%5E2%3D35%5E2%2B9%5E2%5C%5CCD%3D36.13%20m%5C%5Cthus%2C%20%5C%5CAD%3D51.19%2B36.13%3D87.32%20m)
Thus, from the above calculations, we can conclude that, the displacement of the body will be equal to 87.32 m along the direction of AD or in east-south direction.
Learn more about the Displacement here:
brainly.com/question/28020108
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