## Will Mark Brainliest PLZ!!!!!!!!!! If an apple has 18 Joules of potential energy when it is dropped, how much kinetic energy will it have wh

Question

Will Mark Brainliest PLZ!!!!!!!!!! If an apple has 18 Joules of potential energy when it is dropped, how much kinetic energy will it have when it has fallen to one third its original height?

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5 months 2021-08-18T08:12:08+00:00 1 Answers 9 views 0

## Answers ( )

1. Answer: 6 Joules

Explanation:

You are given that the potential energy P.E of the apple = 18 Joules

PE = mgh

Where g = 9.8 m/s^2

18 = mgh

Initially, The mechanical energy of the apple = 18 Joule.

According to conservative of energy

the total energy of the apple will be 18 Joules. That is,

K.E + P.E = 18 Joules

when the apple has fallen to one third its original height, the remaining height from the ground upward will be:

height h = 1 – 1/3 = 2/3

The new Potential energy will be

P.E = 2/3 × 18

P.E = 12 Joules

The potential energy lost must have been converted to the kinetic energy according to conservative of energy

K.E + 12 = 18

Make K.E the subject of formula

K.E = 18 – 12 = 6 Joules

Therefore, the apple will have 6 Joules of kinetic energy when it has fallen to one third its original height.