# Average force applied by baseball on glove

1. Nov 1, 2009

### balletgirl

1. The problem statement, all variables and given/known data
A 0.140-kg baseball traveling 45.0 m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 11.0 cm. What was the average force applied by the ball on the glove?

2. Relevant equations

F=ma ?

3. The attempt at a solution

It is the whole "backward 11.0 cm" part that confuses me.

2. Nov 1, 2009

### JDHalfrack

Clearly, the question is how can you find acceleration?

Hint: if the ball is initially travelling at 45 m/s, and the ball comes to rest after 11 cm, what equation can you use to find acceleration?

3. Nov 1, 2009

### balletgirl

Okay, so I used the equation vf^2=vi^2-2ad.
0= 45^2 - 2*a*.11m
I ended up with 9205 m/s/s as the acceleration.

After plugging it in to F=ma, I got 1,289N as the force. It seems too high.
Thanks by the way.

4. Nov 2, 2009

### JDHalfrack

Excellent. That's what I got too. And, think about it. A baseball travelling 45 m/s comes to rest in only 11 cm! It takes a tremendous amount of force to stop it!