The speed is 16.2 m/s
Explanation:
Assuming the runner is moving by uniform motion (=at constant velocity), then we can find his speed by using the equation:
![v=\frac{d}{t}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7Bd%7D%7Bt%7D)
where
v is the speed
d is the distance covered
t is the time elapsed
For the runner in this problem, we have:
The initial position is 10 m while the final position is 80 metres, so the distance covered is
d = 80 - 10 = 70 m
While the time elapsed to cover these 70 m is
t = 4.32 s
Therefore, substituting into the equation, we find the speed:
![v=\frac{70}{4.32}=16.2 m/s](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B70%7D%7B4.32%7D%3D16.2%20m%2Fs)
Learn more about speed:
brainly.com/question/8893949
#LearnwithBrainly
<span> A. By ensuring that they never engage in risk behaviors
</span>
![F=G\frac{m_1-m_2}{r^2}](https://tex.z-dn.net/?f=F%3DG%5Cfrac%7Bm_1-m_2%7D%7Br%5E2%7D)
![=\frac{(6.67\times10^{-11}N*m/kg^2)(15kg) }{(0.35m)^2}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B%286.67%5Ctimes10%5E%7B-11%7DN%2Am%2Fkg%5E2%29%2815kg%29%20%7D%7B%280.35m%29%5E2%7D)
![=1.2\times10^{-7} N](https://tex.z-dn.net/?f=%3D1.2%5Ctimes10%5E%7B-7%7D%20N)
Because the weight of one ball is mg = 147 N, the gravitational force between the two balls is
or
parts per billion of the weight.
Answer:
Small, made of rocks, made of few moons.
Explanation:
The inner planets are also called the terrestrial planets and are mostly rock. These planets are Mercury, Venus, Earth and Mars.
They are made of dense balls of rocks with a few moons. They are believed to have been formed from denser rocky materials that accreted first during the early formation of the solar system.
Outside the terrestrial planets are the gas giants which are mostly made of large masses of gas. The Asteroid belt separates the inner and outer planet from each other.