How Do Kinetic and Potential Energies Change During a Ball's Ascent?

[nikan_ange]

Homework Statement

a .50 kg ball thrown upward has an initial Kinetic energy of 80 J.

Homework Equations

(a)what are its kinetic and potential energy when it has traveled 3 quarters of the distance to its maximum height?
(b) speed at this point?
(c) potential energy at the maximum height (assume a reference is chosen to be zero at the launch point)?

The Attempt at a Solution

pls reply...i nid it badly...thnks...im working on it now..

 

[dx]

Please show your attempt.

 

[nikan_ange]

i don't have an idea honestly

 

[dx]

Start by finding the maximum height. What is the kinetic energy at the maximum height?