Question

A box of mass 300 kg has gravitational potential energy stored in it equal to 29400 J. Find the height of the box above the ground. (Take g = 9·8 N kg^-1).

Answer 1

m = 300 kg,

P.E. = 29400 J,

g = 9.8 N kg^-1,

h = ?

P.E = mgh

29400 = 300 × 9.8 × h

h = `29400/(300 xx 9.8)`

h = `29400/2940`

h = 10 m