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10 = v^2 : R
10R = v^2
v = wszystko pod pierwiastkiem: 10R
v = pierwiastek z: 50 cm/s ≈ 7 cm/s
Po 1s, v = 5 cm/s
Po 2s, v ≈ 10 cm/s
Odp. W czasie trwania drugiej sekundy ruchu.