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1. . . 3 5 .
2. 5 8 .
3. .
4. Δt 40 (N).
5. Δt ( ) Δt.
6. Δt.
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1. g=9,8 /2
δ = 
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Δ t =
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1.
1. 50 . 400 ?
2.
1. , 0,01 , . 3 . , 70 .
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1. 120 1 . , , 80.
