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  1. A car moving with a speed of 50 kmh⁻¹ can be stopped by brakes after at least 6 m
  2. A heavy nucleus at rest breaks into two fragments which fly off with velocities
  3. According to Bohr model of hydrogen atom, only those orbits are permissible
  4. The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
  5. The escape velocity of a body on an imaginary planet which is thrice the radius