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  1. A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily
  2. A block of mass m is placed on a smooth wedge of inclination θ
  3. Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
  4. A coil has resistance 30 ohm and inductive reactance 20 ohmn at 50 Hz frequency.
  5. The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,