Answers edited by Subhrajit M.

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• A model train with a mass of #4 kg# is moving along a track at #6 (cm)/s#. If the curvature of the track changes from a radius of #32 cm# to #48 cm#, by how much must the centripetal force applied by the tracks change?
  
• If a,b,c are in GP and a + x , b + x, c + x are in HP. Find x where a,b,c are distinct numbers?
  
• What is the oxidation number of the metal in #MnO_4^(-)#, and how do we represent its reduction to #Mn^(2+)#?
  
• A balloon is flying up with a velocity of 5 m/s. at a height of 100 m a stone is dropped from it . at the instant the stone reaches the ground level the height of balloon will be ?