The total energy of the object is 120 J, obtained by adding its kinetic (70 J) and potential (50 J) energies. Therefore, the correct answer is D. 120 J.
The total energy possessed by an object is the sum of its kinetic energy (KE) and potential energy (PE). Mathematically, it can be expressed as:
Total Energy (TE) = Kinetic Energy (KE) + Potential Energy (PE)
In this case, the object has 70 J of kinetic energy (KE) and 50 J of potential energy (PE). Therefore, the total energy (TE) is:
TE = 70 J + 50 J = 120 J
So, the correct answer is: D. 120 J