# Convervation Laws

1. Feb 26, 2008

### soul5

1. The problem statement, all variables and given/known data
In a tennis match, a player wins a point by hitting the ball sharply to the ground on the opponents side of the net. If the ball bounces upward from the ground with a speed of 16m/s and is caught by a fan with a speed of 12 m/s, how high above the court is the fan?

2. Relevant equations
Don't know.

3. The attempt at a solution
How do I start this question?

2. Feb 26, 2008

### cse63146

Start with finding out if there is potential gravitational/spring/kinematic enegery at the beginning or at the end.

$$mgh_i + .5m(v_i)^2 + .5k(x_i)^2 = mgh_f + .5m(v_f)^2 + .5k(x_f)^2$$

3. Feb 27, 2008

### soul5

k i'll do that