Answer :

To determine the values the total mechanical energy of the given problem we can first identify the values given Given are:
1.       Kinetic Energy = 5.2 Joules
2.       Potential Energy = 3.5 Joules
Solution:
The formula for mechanical energy is
a.      
Mechanical energy is total energy of both kinetic and potential hence,

i.     
ME = PE + KE
                                  
ii.     
ME = 3.5 + 5.2
                                                           
iii.     
ME = 8.7 Joules