Can the kinetic energy formula EK = MAS be derived from the gravitational potential energy formula EP = MGH? The value of gravitational potential energy calculated by gravitational potential energy formula is equal to the kinetic energy of the object at the moment of contact with the ground when it falls to the ground at that height Since kinetic energy is scalar, can we use acceleration a instead of acceleration g and distance s instead of height h to get EK = MAS? If an object moves horizontally, the initial velocity is known to be zero, the mass, the distance, and the kinetic energy of the velocity is calculated. Isn't this the same as doing a free falling body vertically? In this way, some problems can be solved, such as the initial velocity is zero, the mass is 0.2kg, the acceleration is 5mgs square, and the kinetic energy after 20m can be calculated. In this way, EK can be calculated directly without using the kinematic formula So, is EK = MAS equivalent to EK = 1 / 2 MV ^ 2? Can it be used as a kinetic energy formula? Thank you very much

This formula can be used only when the work is done by constant force. There are essential differences between the two. One is the process quantity, and the other is the state quantity. However, it can be used when the initial velocity is 0 and the force is constant

When the formula 1 / 2mV ^ 2 = MGH is used, the requirement for the starting point of the tape is that the distance between the first and second points of the tape should be close

If we think that the speed of hitting the first point is 0, then we can get it from H = 1 / 2GT ^ 2, and the spacing is 2mm. But in the specific experiment, there will be another situation. If the puncher starts to move after hitting the first point (the difference between 1 and 2 points is 0.02s), the distance in the middle will be small

For example, 1 5 13 29. How to sum? Second order equal ratio sequence sum

Use the first n-1 term of the following two-level equal ratio sequence to sum, then subtract 3 (n-1), and then add the last term. You can see that 4 is greater than 1, 8 is greater than 5, 16 is greater than 13, 32 is greater than 29! Therefore, you can summarize the general term formula!
The sum of the first n terms is: SN = 2 ^ (n + 2) - 4-3n
The last term: an = 2 ^ (n + 1) - 3
Methods: an = an-1 + 2 ^ n
An-1=An-2+2^(n-1)
..
A2=A1+2^2
Add both sides of the equation:
An=A1+2^2+2^3+.2^n
=1+4*[1-2^(n-1)]/(1-2)
=1+4*[2^(n-1)-1]
=1+2^(n+1)-4
=2^(n+1)-3

For the equation x (x-1) = 2, Li Hua gave the following solution: ∵ x (x-1) = 2 = 1 * 2 = (- 1) * (- 2), ∵ ① x = 1, X-1 = 2; ② x = 2, X-1 = 1; ② x = 2, X-1 = 1; ② x = 2, X-1 = 1; ② x = 2, X-1 = 2, X-1 = 1;
Or ③ x = - 1, X-1 = - 2; or ④ x = - 2, X-1 = - 1
If we solve equation group 2, we get x = 2; if we solve equation group 3, we get x = - 1; if we solve equation group 1, we get no solution
The solution of the equation x (x-1) = 2 is X1 = - 1, X2 = 2
Excuse me: is the above solution correct? Explain your reasons

The above solution is completely incorrect, because this solution only uses a special value to substitute. With this solution, we can also get x (x-1) = 2 = 0.5 * 4 = 0.4 * 5 =. Do we need to solve the equation one by one? If the solution of some equations is fractional, the above method can not be solved completely. This is not in line with the universality, the correct solution should be to decompose the equation

How do you understand the passage at the end of the article
In the following years, I have encountered tens of thousands of times more sad things, but most of them are deeply hidden in my heart, making my heart broken and my heart broken. However, there has never been such a painful cry as when I was young. This should be the sorrow of adults. I can only be sad, but I can't cry

When you are young, you will cry when you encounter something unsatisfactory. Only because you have parents to rely on, when you grow up, when you encounter sad things, you should learn to be strong. When you grow up, when you encounter big sad things, you should hold back the tears in your eyes and not let them flow out, because you have become an adult. You should learn to be strong and strong again

The ratio of 2:5:0.125 is (), which is the simplest integer ratio（

The ratio of 2:5:0.125 is (21), and the simplest integer ratio is (21:1)

How to solve the following equation: 8 (x-6.2) = 41.6 x-0.36x = 16 before nine o'clock, hurry~~~

（1）8（x-6.2）=41.6
8x-49.6=41.6
8x=41.6+49.6
8x=91.2
x=11.4
(2) x-0.36x =16
0.64x=16
x=16/0.64
x=25
Give me a point

What is the formula of surface area and volume of cube?

Surface area side length x side length X6 volume side length x side length x side length

Urgent: because cos square a is equal to 1 / 4, so cosa is equal to 1 / 2,

∵ cosa = (COSA) =, ∵ cosa = ±. For example, if a is an acute angle, it can be determined that cosa is a positive number. Follow up question: Oh, thank you for your answer! Originally, cos square a equals (COSA) square. After reading it, I suddenly realized that, oh, the title said that a belongs to (0180 degrees / 2), so cosa is a positive number, but thank you!

2 / 9 + 3 / 4 = 5 / 9 x 3 / 7 x + 11 / 7 x = 12,

2 / 9 + 3 / 4 = 5 / 9 x
2/9+3/4=5/9 x
8+27=20x
20x=35
x=1.75
Three out of seven x + eleven out of seven x = 12
3x/7+11x/7=12
3x+11x=12X7
14x=84
x=6