The work is done on this process equal to the changing the potential energy of the mass. Suppose, the initial potential energy was "U_0 = 0J". The final potential energy is:
"U = mgh"
where "m" is the mass of the body and "h = 15 m" is the height the body was raised to.
Thus, the work will be:
"A = U - U_0 = mgh - 0 = mgh\\\\\nA = m\\cdot 10 m\/s^2\\cdot 15 m = 150m\\space J"
where "m" is mass of the body in kg.
Answer. A = 150m J.