A person trying to lose weight(dieter ) lifts a 10kg mass, one thousand times, to a height of 0.5 m ech time. Assume that the potential energy lost each time she lowers the mass is dissipated .
How much work does she do against the gravitational force ?

Explanation

Here, m = 10 kg, h = 0.5 m, n = 1000
Workdone against gravitational force W = n (mgh)
`= 1000 xx (10 xx 9.8) xx 0.5 = 49000 J`