# Help with acceleration, magnitude, and direction of force

jayyafeelme

## Homework Statement

As a baseball is being caught, its speed goes from 28.0 m/s to 0.0 m/s in about 0.0050 s. The mass of the baseball is 0.140 kg.

What is the baseball's acceleration?
What are the magnitude and direction of the force acting on it?
What are the magnitude and direction of the force acting on the player who caught it?

f=ma?

## The Attempt at a Solution

28.0 m/s x 0.140 kg = 3.92

Homework Helper

## Homework Statement

As a baseball is being caught, its speed goes from 28.0 m/s to 0.0 m/s in about 0.0050 s. The mass of the baseball is 0.140 kg.

What is the baseball's acceleration?
What are the magnitude and direction of the force acting on it?
What are the magnitude and direction of the force acting on the player who caught it?

f=ma?

## The Attempt at a Solution

28.0 m/s x 0.140 kg = 3.92

You calculated momentum. The force will be change in momentum over the time period.

If v = a*t you should be able to figure the acceleration.

jayyafeelme
so 28.0 m/s x 0.0050 s?

Homework Helper
so 28.0 m/s x 0.0050 s?

Not the way I do algebra.

jayyafeelme
v divided by 0.0050 s? please help me i really need to get this done

Homework Helper
v divided by 0.0050 s? please help me i really need to get this done

That gives you acceleration.

jayyafeelme
but isnt v = velocity? and v = distance/time? they dont give me a distance

jayyafeelme

borgwal
Can you do better than randomly multiplying quantities? Pion gave you v=a*t, which quantities do you know in this equation?

jenglish
you're going to need an equation that can find the acceleration (or deceleration) when given an initial as well as final velocity and time.

I suggest

Vf=Vo+at

that should give you acceleration