A 80 kg person expends 400 W when walking on a horizontal tracker belt at a speed of 7.2 kph. When the tracker belt is inclined without changing the speed, the person's expended power increases to 600 W. Estimate the angle of incline of the tracker belt by assuming that all of the increased output power goes into overcoming the force of gravity. Assume constant friction by tracker belt in both horizontal and inclined position `Take g=10m//s^(2)`

Answer

`[7.31^(@)35.45^(@)]`