Answer:
2744Nm
Explanation:
The gravitational field is conservative. The gravitational force only acts on a vertical direction. Hence, independently of the form of the trajectory, the work done by the gravity against the person demands the calculation of the integral of the force multiplied by the vertical displacement of the person:
![W_g=\int_0^{4}Mgdz=Mg[4]=(70kg)(9.8\frac{m}{s^2})(4m)=2744Nm](https://tex.z-dn.net/?f=W_g%3D%5Cint_0%5E%7B4%7DMgdz%3DMg%5B4%5D%3D%2870kg%29%289.8%5Cfrac%7Bm%7D%7Bs%5E2%7D%29%284m%29%3D2744Nm)
where we have taken that the displacement of the person h=z and df=dz.
hope this helps!!
297.729km :-) hope this helps
An example you could use for this would be if you threw a pencil across the room 10m away. the pencil would have travelled 10m(N). you could determine the objects speed by using the formula speed=distance/time. you would have had to time how long it took for the pencil to hit the 10m marking and divide 10 by however many seconds it took.
I hope that helps you!!!!!!
D. Redefine the machine’s system boundaries.
The Law of Conservation of Energy states that energy can't be created not destroyed. Energy, however, can be changed from one form to another. The law applies to isolated systems only. By redefining and expanding the system (including all factors affecting it) , the machine's ability to do work should improve.
