You throw a ball straight up from the edge of a cliff. It leaves your hand moving at 12.0 m/sm/s. Air resistance can be neglected. Take the positive yy -direction to be upward, and choose yy = 0 to be the point where the ball leaves your hand. Find the ball's position 0.300 s after it leaves your hand.

y = 3.16 m

Explanation:

Once thrown straight up, the only influence on the ball is gravity, which acts slowing down the ball.

In absence of gravity, the ball had moved forever  with the same initial velocity, so the displacement at a time t had been as follows:

y = v₀*t

Due to the action of gravity, the actual displacement is less than this value, and can be calculated with the following equation:

Replacing by v₀ = 12. 0 m/s, t = 0.300 s, and  g = 9.8 m/s², we  can solve for the vertical displacement, as follows:

So, the position (taking the origin coincident with the point where the ball leaves the hand), is just the vertical displacement we have just found.

⇒ y = 3.16 m

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like . (i crazy)

most famous scientist who contributed to this physics are:

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.