Potential energy sample question: A block is sitting on a platform 20 m high. It weighs 50 kg. How much potential energy does it contain?

Potential energy (PE) = mgh

The potential energy is 9800 J.

Explanation:

given information:

mass, m = 50 kg

height, h = 20 m

to calculate the potential energy, we can use the following formula

PE = mgh

where

PE = potential energy (Joule)

m = mass (kg)

h = height (m)

g = gravitational constant (9.8 m/s²)

so,

PE = mgh

    = 50 x 9.8 x 20

    = 9800 J

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.