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  1. An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp
  2. A ball is dropped from a high rise platform at t = 0 starting from rest
  3. A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
  4. A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils.
  5. A body is under stress F and has Young’s modulus Y, then the energy