Question

What is the energy of a 4kg apple that is sitting on a 2 m high tree branch?

Answer 1

78.4 joules is the energy of a 4 kg apple that is sitting on a 2 m high tree branch.

Explanation:

When an apple falls to the ground from a tree, its positional energy (stored as potential gravitational energy) turns into kinetic energy, during a fall. Chemical potential energy is chemical energy because it is food and potential energy as it can still have ability to move. So, in the given case, kinetic energy is zero.

To find potential energy, the formula would be

             $\text { potential energy }(P . E)=m \times g \times h$

Where, given

m – Mass – 4 kg

$g-\text { Earth'sgravity }-9.8 \mathrm{m} / \mathrm{s}^{2}$ (Known value)

h – Height -  2 m

Substitute these values, we get

                  $P . E=4 \times 9.8 \times 2=78.4 \text { joules }$