137 question is a doubt

Q137. A block of mass 1 kg kept on a rough horizontal surface ( μ  = 0.4) is attached to a light spring (force constant = 200 N/m) whose other end is attached to a vertical wall. The block is pushed to compress the spring by a distance d and released. Find the value (s) of 'd' for which (spring + block) system loses its entire mechanical energy in form of heat.

 (A) 4 cm                        (B) 6 cm                      (C) 8 cm                     (D) 10 cm

Energy lost = work fone by friction (Kx^2)/2= umgx On solving x=0.04m

  • -5
Energy lost = work fone by friction (Kx^2)/2= umgx On solving x=0.04m
  • -2
What are you looking for?