Answer to Question #267980 in Physics for louis

Question

Determine the energy of a swinging pendulum bob at its highest position, at the middle position, and at its lowest position which will be considered the reference level. The length of the string is 1 m and the height of its highest position is 1.5 m. The mass m of the bob is 0.20 kg.

Answer 1

No matter what the position of the bob is, its total mechanical energy is the same, it is defined by the initial height of the bob:

$$E=mgh=mg(H-L)=0.98\text{ J}.$$