Asking our simple question for the 41st time.

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1) Consider carefully and thoroughly (and many times!) the link

https://www.youtube.com/watch?v=xX14NK8GrDY .

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2) Assume that:

a) Ma = 1 kg;

b) Mb = 4 kg; the value of Mb can be either increased or decreased as many times as you want;

c) V1 = 1m/s = const;

d) Ffr. = force of friction inside the zigzag channels = 0.0000001 N; the latter can be further decreased as many times as you want;

e) N = number of zigzags = 10; the value of N can be either increased or decreased as many times as you want;

f) Shapes of the zigzags = sinusoids; the latter can be replaced by any other curve patterns.

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3) It is evident that (always) V2 > 0 m/s and V3 > 0 m/s.

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4) It is evident that if V2 = 0.6 m/s and if V3 = 0.1 m/s, then (a) the law of conservation of linear momentum is valid and (b) the law of conservation of mechanical energy is invalid.

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5) It is evident that if V2 = 0.8 m/s and if V3 = 0.3 m/s, then (a) the law of conservation of linear momentum is invalid and (b) the law of conservation of mechanical energy is valid.

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6) It is evident that if (a) V2 is not equal to 0.6 m/s, and if (b) V2 is not equal to 0.8 m/s, and if (c) V3 is not equal to 0.1 m/s, and if (d) V3 is not equal to 0.3 m/s, then both (e) the law of conservation of linear momentum and (f) the law of conservation of mechanical energy are invalid simultaneously in this special particular zigzag case, which is described in the link

https://www.youtube.com/watch?v=xX14NK8GrDY .

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Asking again our simple question for the 41st time.

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QUESTION: Do you have any objections against any of the above items 3-6? Yes or no? (And if yes, then specify exactly which item you do not agree with and why.)

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Looking forward to your answer for the 41st time.

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P.S. It is interesting to note a simple interesting experimental fact, which is as follows.

A) A certain number and a certain shape of the zigzags lead to the validity of the above written item 4.

B) Another combination of number and shapes of the zigzags leads to the validity of the above written item 5.

C) And a third combination (and more precisely, a group of combinations) of number and shapes of the zigzags leads to the validity of the above written item 6.