An industrial demolition ball of mass 240 kg is suspended from a crane. To perform a strike on a structure, the ball is released from rest and swings downwards, converting its gravitational potential energy into kinetic energy.
Calculate the minimum vertical height, h h\,h metres, from which the ball must be released to gain 8232 J of kinetic energy just before it strikes the structure.
Take the acceleration due to gravity, g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2.