Помогите, физика. 1 и 2

Question

Помогите, физика.
1 и 2

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Answer 1

1) 56/26Fe+1/0n=>56/25Mg+1/1H
94/42Mo+2/1H=>95/43+1/0n
2_ k*x^2/2=m*V^2/2
V=x*sqrtk/m)=0,03*sqrt(200/4*10^-3)=6,7 м/с