How hard did Saitama punch Genos?

In episode 5 of One Punch Man, Genos wants Saitama to demonstrate his full capabilities in a no bars hold fight. Saitama flawlessly avoids every one of Genos' strikes & catches him off-guard, throwing one punch that he stops immediately before hitting Genos. Taken aback, Genos absorbs the moment, & looks behind him to find that the cliff that was just behind him is now totally demolished!

When I saw this episode of One Punch Man some time in 2016, I was entranced with all kinds of questions; but the biggest was "Just how hard did Saitama punch Genos???!!"

Well, this thread will be me finding just that.

To start, we have to revisit a few very basic things. I am by no means a seasoned physicist, so you should take all of this with a grain of salt! 

Newton's Law of Kinetic Energy states that an object's kinetic energy, which is it's ability to do work, is measured by half of it's mass multiplied by it's velocity squared: Or 1/2m(v^2). This is important because in order to actually measure the power of Saitama's punch, we need to understand what joules are & how they are measured. This alone is not enough though. In order to measure the kinetic energy of the punch I need to estimate the mass of the cliff itself.

Let's take some clues!! For this visual experiment, I will be using Genos' height as stated by the wiki page. Then, I measure the area of the displacement by cubic square feet! 




As represented by our visualization, the displacement is approximately 11 Genos units high, 19 wide, & my measurement for the length is a shot from the hip at about 2.3 times longer than the width. That being said, we now have to convert our units to inches, & inches to feet! 770 x 1330 x 2966 / 12 ----> 64 x 110 x 247

So now that we have our dimensions, we find that the area is, give or take 1,738,880 ft^3. Now, in order to measure the mass, I had to dip my feet into geology & understand what kind of rocks mountains mostly comprise of. I found that on average, the mass of a rock is usually ~3 grams/cm^3. With that being the case, I now have to convert my feet to centimetres. If 1 foot is 30.48 centimetres, & 1 pound is 453.5924 grams, then our area is 1,786,054,516,596 cm^3 & the approximate weight of the displaced area is ~3,937,575,931 lbs. 

More findings soon!!