What is the gravitational potential energy of a # 18 kg# object on a shelf # 7/9 m # high?

Answer 1

#137.3 J#

The answer can be obtained by using the equation below:

Let's identify the known and unknown variables:

#color (blue)("Knowns:")#
- Mass
- Change in height
- I am going to assume that the acceleration of free fall is #9.81 m/s^(2)#

#color(magenta)("Unknowns:")#
- Gravitational potential energy

Our known variables have good units, so all we have to do is plug the given values into the equation and solve for the gravitational potential energy like this:

#"gravitational potential energy" = #

#18kgxx 9.81 m/s^(2)xx (7/9) m# #= 137.3 J# or #137.3 (kgxxm^(2))/(s^(2))#

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Answer 2

Leo Abeyta

The gravitational potential energy of the object is approximately 124.2 joules.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.