calculate the energy possessed by a stone of mass 10 kg kept on a height of 5m(g = 9.8)

As it possess potential energy,

  so,     PE = mgh

It is given,  m = 10 kg,  h = 5m,  g = 9.8

  So,  subtituting the value of variables ,

  PE = 10 * 5 * 9.8 

  =  490 Joules

Therefore ,  the energy possessed by a stone is  490 Joule .