# Finding Acceleration in f=ma

1. Jan 24, 2012

### trynagetby

1. The problem statement, all variables and given/known data

The fastest served tennis ball, served by "Big Bill" Tilden in 1931, was measured at 73.14 m/s. The mass of a tennis ball is 57.0 g, and the ball is typically in contact with the tennis racquet for 30.0 {\rm ms}, with the ball starting from rest.

2. Relevant equations

F=ma
p=mv (?)
don't understand how to find the acceleration

3. The attempt at a solution

f=57(a)

found the momentum in an attempt to relate it to acceleration, but I failed. Any ideas on how to find the acceleration?

2. Jan 24, 2012

### PhanthomJay

What's the definition of acceleration?

3. Jan 24, 2012

### SammyS

Staff Emeritus
Hello trynagetby. Welcome to PF.

The ball goes from zero to 73.14 m/s in 30 milliseconds. What's the average acceleration ?

4. Jan 25, 2012

### trynagetby

so it should be this

a=(Vf-Vo)/t

30 milliseconds = .03 seconds

73.14/.03 seconds

= 24380 ?

57(24380) = 1389660 but my online homework is telling me thats wrong

5. Jan 25, 2012