Question

A 15 kg television sits on a shelf at a height of 0.3 m. How much gravitational potential energy is added to the television when it is lifted to a shelf of height 1.0 m?

Answer 1

15x 9.8 x .3 = 44.1
15 x 9.8 x 1 = 147
147 - 44.1 = 102.9J
102.9 J

Answer 2

Added energy to the television, E'' = 102.9 J

Step-by-step explanation:

Given that,

Mass of the television, m = 15 kg

It is at a height of, h = 0.3 m

Potential energy at this height is given by :

E = m×g×h

`E=15* 9.8* 0.3`

E = 44.1 J

When it is at a height of, h' = 1 m

Potential energy is given by :

E' = m×g×h

`E'=15* 9.8* 1`

E' = 147 J

So, added potential energy is, E'' = E'-E

E'' = 147 J - 44.1 J

E'' = 102.9 J

So, 102.9 J of energy is added to the television. Hence, this is the required solution.