a wieght of 10kg mass is raised through a hieght of .8 meter from 1.5 meter to 2.3meter against force of gravity.how much energy isrequired in cals.
The work required equals the potential energy change,
Work = M*g*(change in elevation)
The change in elevation is 0.8 meters.
With mass M in kg and g in m/s^2, the answer will be in Joules.