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  1. Radii of curvature of a converging lens are in the rato 1:2. Its focal length
  2. An aicraft executes a horizontal loop of radius 1 km with a speed of 900 kmh⁻¹
  3. The electron drift speed is small and the change of the electron is also small
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  5. If a body travels half the distance with velocity v1 and the next half with velocity v2