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b) R = U²/P
c) R = mv²/F
m = FR/v²
d)m = 2E/v²
a)
k = a/(x + y)
b)
k + b/(2-a)
c)
c = (k +1)b + 2k
c = kb + 2k + b
c - b = k(b + 2)
k = (c - b)/(b + 2)
Pozdrawiam.