Answer: Gravitational force between the two masses does not depend on the medium separating two masses.
The deceleration experienced by the gymnast is the 9 times of the acceleration due to gravity.
Now from Newton`s first law, the net force on gymnast,
![F_{net} =F-W=ma](https://tex.z-dn.net/?f=F_%7Bnet%7D%20%3DF-W%3Dma)
Here, W is the weight of the gymnast and a is the acceleration experienced by the gymnast (
acceleration due to gravity)
Therefore,
OR ![F=ma+mg=m(g+a)](https://tex.z-dn.net/?f=F%3Dma%2Bmg%3Dm%28g%2Ba%29)
Given
and![a=9\times g=9\times 9.8 m/s^{2} =88.2 m/s^{2}](https://tex.z-dn.net/?f=a%3D9%5Ctimes%20g%3D9%5Ctimes%209.8%20m%2Fs%5E%7B2%7D%20%3D88.2%20m%2Fs%5E%7B2%7D)
Substituting these values in above formula and calculate the force exerted by the gymnast,
![F=(40 kg) (88.2 m/s^{2} +9.8 m/s^{2} )](https://tex.z-dn.net/?f=F%3D%2840%20kg%29%20%2888.2%20m%2Fs%5E%7B2%7D%20%2B9.8%20m%2Fs%5E%7B2%7D%20%29)
![F=3.537\times10^{3}N](https://tex.z-dn.net/?f=F%3D3.537%5Ctimes10%5E%7B3%7DN)
Answer:
4.2 is the answer
Explanation
The image formed in a plane mirror is an equal distance behind the mirror as the object in front of it.
Step 1: the equation to this problem would be: 8.4/2
Step 2: 8.4 ÷ 2 = 4.2
Answer:
B erosion
Explanation:
Erosion would usually require water