a wieght of one kg is raised through a distance of .8 mtr against gravity in the up ward direction from 1.5 mtr to 2.3o mtr.how much energy is burnt in joules or cal.
The work done to make that happen is
W = M g H
If M is in kg, g is in m/s^2 and H is in meters, the answer will be in Joules.
You won't get that amount of work by "burning" an equivalent amount of joules. Because of the second law of thermodynamics, you will need more. Heat cannot be turned completely into work