u/That_Explorer_6043

I will be going to university at september and i need a tablet to take notes on pdfs and such. I am going to study medicine. The ones people recommended me was iPad Air M4 (maybe i am wrong i dont know the exact model), Honor Magic Pad 4 and Samsung Galaxy S10 Plus. They have approximately the same price where i live or just relevant in price. I can buy any of them. But i dont know which to choose or even if i should choose another model. I dont want it to be much more expensive than those three if you are going to recommend any other model. Please help me to choose and tell me the pros and cons.

An object of mass m, released from rest at point A on a frictionless inclined plane, collides with a spring of spring constant k at point B and compresses the spring until point C. During this process, the energy stored in the spring becomes E.

​

Accordingly, which of the following statements are correct?

​

I. If m is increased, E increases.

​

II. If the object is released from a point between A and B, E does not change.

​

III. If k is increased, E decreases.

​

A) I only

B) II only

C) I and II

D) I and III

E) I, II and III

​

The answer is D) and i did the question right on the test. But it just feels kind of off for me. I just tried to write down a formula to satisfy myself but i wonder if it is wrong?

​

E = 1/2(mv²) + x.sin(α).m.g

​

m is for the mass of the block

v is for the velocity when the block reaches to the B point

x is for how much the spring compressed in length

α is for the angle between the edge of the inclined plane that touches the ground and the hypotenuse

​

The energy stored in the spring can be put as two parts:

​

1. The gravitational potential energy that turned into kinetic energy of the block and after that turned into elastic potential energy which is stored in the spring

​

2. The gravitational potential energy that turned into the elastic potential energy because when the kinetic energy that block gained previously was turning into the elastic potential energy, the block did lose height because spring had a diagonal position

​

So the reason for why i added the extension after kinetic energy formula was because of the second one.

​

Can you tell me if it is correct? And can you tell me the correct way to put it on the formula in a basic way if it is wrong or written poorly?

​

​