Is mechanical energy can be negative???Explain how,since energy is a scalar quantity then why???

Asked by Ravikant | 22nd Nov, 2015, 08:26: PM

Expert Answer:

Yes mechanical energy can be negative. Mechanical energy is the sum of potential as well as kinetic energy.
Negative sign in the energy does not have anything to do with the direction. Hence, being scalar has no bearing on the fact that energy cannot be negative.
The kinetic energy is always positive, but the potential energy can be negative.
Negative sign only indicates that the system is either bound or the reference point is taken such that potential energy is negative.

Answered by Romal Bhansali | 23rd Nov, 2015, 10:50: AM