Question

A boy throws a ball up into the air with a speed of 12.3 M/S the ball has a mass of 0.25 KG how much gravitational potential energy will the ball have at the top flight

Answer 1

18.9

Step-by-step explanation:

Answer 2

18.9 J

Step-by-step explanation:

The computation of the gravitational potential energy is shown below:

In this question, we use the law of conservation of energy

As we know that

`E=U+K = mgh + (1)/(2)mv^2`

where

U = potential energy

And K = kinetic energy

h = 0

u = 0

Now placing given values to the above formula

`E_i = K_i = (1)/(2)mv^2`

`= (1)/(2)(0.25 kg)(12.3 m/s)^2`

`=18.9 J`

As we know that

Total mechanical energy equivalent to potential energy

`E_f = U_f`

However, the mechanical energy is conserved, Ef = Ei, so

`U_f = K_i`

Therefore the potential energy at the top of the flight is

`U_f = K_i = 18.9 J`