Pure maths, physics, logic (braingames.ru): non-trade-related brain games - page 19
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The assumption is clearly wrong.
Energy from "almost".
The ball in this case is much lighter than a brick, as the word almost in Russian is usually interpreted as "quite a bit". :)
The ground has a lot more mass, is stationary, so all the momentum from the ground is returned to the ball.
The spring straightens after compression more than its original length (by inertia). But here there is still a brick on the spring. The energy is completely transferred to the ball and is proportional to the mass of the brick. The brick is pulled down also in proportion to the mass of the brick.
Therefore, I got "almost 0 cm". Maybe I didn't take something into account.
Probably for most people changing the frame of reference is an almost impossible task. At least until some "dad" tells them to.
I have already hinted that in this case the most convenient coordinate system to understand is the ball. Should I have added that I am the cool authority here? :))))
What does this have to do with the mass ratio of the earth to the brick can you explain?
"Almost" could be due to energy loss.
It can't. The problem is that the ball is perfectly elastic. Wanna bet?
...........
The spring straightens after compression more than its original length (due to inertia). .........
Okay. The ball is resilient, but the brick? Is there no friction?
It's secondary. So it'll change "almost" by a couple of millimetres - not significant. Although I assume the brick is also "round-in-vacuum". ;)
They all have bricks like that on their website... :))
P.S. Hint: Replace the ball with a spring, it will be easier.
The ball cannot be exchanged for the spring in this case. The spring has a state of rest. It can be stretched and compressed.
The ball can only be compressed.
Probably for most people changing the frame of reference is an almost impossible task. At least until some "dad" tells them to.
I have already hinted that in this case the most convenient coordinate system to understand is the ball. Should I have added that I am the cool authority here? :))))
What does this have to do with the mass ratio of the earth to the brick?
Right) I didn't see the coordinate system change in your post from ground to ball. I agree with almost 50.