Question

The P.E. of an oscillating particle at rest position is 15 J and its average K.E. is 5 J. The total energy of particle at any instant will be

• A. 10 J
• B. 15 J
• C. 25 J
• D. 5 J

Answer 1

Answer: (B)

15 J

At rest $P.E. = 15 J \\ K.E. = 0

We know $\text{Total Energy}=\text{Potential energy}+\text{Kinetic Energy}=\text{Constant}$ (Energy conservation)

So, Total energy $=\text{total energy at rest}=P.E.+K.E.=15+0=15J$