Answer:
 Potential energy = 73.575 kJ
 Kinetic energy = 135kJ
 Total mechanical energy = 208.575 kJ
Explanation:
  The potential energy of a body is given by the expression, PE = mgh, where m is the mass of the body, g is the acceleration due to gravity value and h is the height of the body.
 The kinetic energy of a body is given by [tex]KE=\frac{1}{2} mv^2[/tex], where v is the velocity and m is the mass of body.
 Total mechanical energy = Kinetic energy + Potential energy
 [tex]KE=\frac{1}{2} mv^2=\frac{1}{2} *75*60^2= 135000J = 135kJ[/tex]
 PE = mgh = 75*9.81*100 = 73575 J = 73.575 kJ
 Total mechanical energy = Kinetic energy + Potential energy = 135+73.575
                       = 208.575 kJ  Â
