What is Projectile Kinetic Energy?

[slaw155]

Homework Statement

Solved

Homework Equations

The Attempt at a Solution

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[Nathanael]

The ball has some kinetic energy at it's maximum height which you've neglected.

Edit:
I said you would be right if it was launched straight up, but that's not true. Sorry, I'm tired.
(If it was launched straight up you would use 8.2m for "h" not 12.9m)

 

[ASHU]

v=47.6 m/s
Is that the right answer?
calculate vertical component and horizontal component separately.

 

[Nathanael]

v=47.6 m/s
Is that the right answer?

Yes.