A body of mass 5kg falls from height of 10m above the ground what kinetic energy of the body before it strike the ground

Gravitational Potential Energy (GPE) before fall = Kinetic energy on impact

GPE = mgh

GPE = 5kg x 9.8m/s^2 x 10m

GPE = 490 J

Kinetic Energy = 490 J

(This is assuming that gravitation field strength (g) is 9.8m/s^2, sometimes you may round this to 10m/s^2, therefore making the final result:

Kinetic energy = 500 J)