If a television with mass 15kg is lifted to a shelf of height 1.2 m, how much gravitational potential energy is added to the television.

The gravitational potential energy added to the television is 176.4 J

Explanation:

Conceptual analysis

Potential Energy (U) is the energy of a body located at a certain height (h) above the ground and is calculated as follows:

U = m × g × h  Formula (1)

U: Potential Energy in Joules (J)

m: mass in kg

g: acceleration due to gravity in m/s²

h: height in m  

Equivalences

1 N = 1 (kg×m)/s²

1 J = N × m

Known data

m = 15kg

g = 9.8 m/s²

h = 1.2m

Problem development

We replace data in formula (1)

U = 176.4 J

The gravitational potential energy added to the television is 176.4 J

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the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.