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  1. At a metro station, a girl walks up a stationary escalator in time t₁
  2. Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .
  3. An atom bomb weighing 1 kg explodes releasing 9×10¹³ J of energy.
  4. A drum of radius R and mass M, rolls down without slipping along an inclined plane
  5. A planet moving along an elliptical orbit is closest to the sun at a distance of r₁