Answer:8.68 m/s
Explanation:
Given
If the height of vault is h=4.85 m
her center of mass is 1 m above ground
Net height h=3.85 m
conserving energy
Kinetic Energy=gain in Potential Energy
![\frac{1}{2}mv^2=mgh](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7Dmv%5E2%3Dmgh)
![v=\sqrt{2gh}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B2gh%7D)
![v=\sqrt{2\times 9.8\times 3.85}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B2%5Ctimes%209.8%5Ctimes%203.85%7D)
![v=\sqrt{75.46}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B75.46%7D)
Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip.
Answer
His speed was 2 m/s, and his velocity was 0.
Answer: a few ton
Explanation:
Average-sized star like sun eave behind white dwarfs and they are almost of the same size as the earth due to gravity .
A teaspoon of white dwarfs is about 15tons.
Answer:
C) the equation consists of two factors:
work = force * distance
W = F · S