Pure maths, physics, logic (braingames.ru): non-trade-related brain games - page 23

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TheXpert:
670.
Oh, man... I'm already afraid to give you a problem. I have the same answer.
 
joo:

The second ball rolls back slightly towards the rebound of the third.

No, it will roll away at almost exactly half the speed of ball 1. In the same direction.
 
Mischek:
No, two meters, that's out of the question.
It's out of the question: the mass of the ball is unknown, so it could jump a kilometre.
 
Mathemat:
Yes in any case: the mass of the ball is unknown, so it could go up by a kilometre.
)) That's not what it was about.
 

Oh, another problem

A perfectly elastic ball bounces on a perfectly elastic surface with an amplitude of 1 cm. How can a brick thrown from a height of 1m be used to lift the ball to a height of 30m? (You can draw a picture.)

 
Mathemat:
Anything: the mass of the ball is unknown, so it could jump a kilometre.

Nah, try solving my problem.)

And give me something else :)

 
Contender: Honestly, as soon as someone (let's not point the finger ;) ) suggested replacing the ball with a spring, I had a suspicion that someone had already googled it.
Not googled, honestly!!! It just came up on its own.
 

What the answers are, what the google gum questions are...

To try to come up with a task yourself, how do you look at it

 
Mathemat:

The first problem is correct. I told you that TheXpert is good at physics.


He knows too much.)
 
Zeleniy: Try to think of a problem on your own, how do you look at it?

One.

Two.

Solve it :) The first one is two to three. The second -- three to five.

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