Question

how much work is done when a body of mass 'm'is raised to a height 'h'above the ground

Answer 1

work done = force * displacement
force here means weight of the object = 9.8N
displacement = height
therefore work done = 9.8N * h meters 

Answer 2

the work done is equal to the potential energy of the object i.e mgh where g= gravitational constant=10 or 9.8