Question

Do you stand on a balcony and throw your bouncy ball up words with 7.2 J of kinetic energy. The ball has 8.3 J of gravitational potential energy when it left your hand. How much total energy does the ball ha as it leaves your hand?

Answer 1

15.5 J

Step-by-step explanation:

The total mechanical energy of the ball is the sum of its kinetic energy and gravitational potential energy:

E = K + U

where

K is the kinetic energy

U is the gravitational potential energy

For the ball in this problem,

K = 7.2 J

U = 8.3 J

So, its total energy is

`E=7.2+8.3=15.5 J`