# Homework Help: Work Energy

1. Oct 20, 2008

### blayman5

1. The problem statement, all variables and given/known data
An outfielder throws a 2.01 kg baseball at a
speed of 108 m/s and an initial angle of 11.9◦.
What is the kinetic energy of the ball at the
highest point of its motion? Answer in units
of J.

2. Relevant equations
change KE=W
R=Vi^2/g (sin2O)
V^2=Vi^2+2ax
F=ma
W=Fx

3. The attempt at a solution
Found the range
Plugged it into galileo's formula to find the acceleration
found the force F=ma
multipled by range

2. Oct 20, 2008

### LowlyPion

What they are basically asking for is what is the KE at max height.

When the ball's flight is maximum, then all the vertical velocity is stored in potential energy. That leaves only the horizontal component of velocity needed to figure its mV2/2

3. Oct 20, 2008

### blayman5

That means there would be no kinetic energy because of the conservation on energy?

4. Oct 20, 2008

### blayman5

vox=vocosO =105.679m/s
KE=mv^2/2
=11,223.9 J

Thanks Lowlypion