Posted by **Sioraf** on Sunday, April 11, 2010 at 2:09pm.

A baseball thrown at 25.0m/s strikes a catcher's mitt and slows down to rest in 0.500 s. What is the magnitude of the ball's acceleration?

I'm having trouble finding the process of figuring out this question. Help?

- Physics -
**drwls**, Sunday, April 11, 2010 at 2:13pm
All you need to answer this is the DEFINITION of acceleration.

The acceleration is the speed change divided by the time. In this case, it is a negative number because the speed is decreasing.

a = (0 - 25.0)m/s /0.500 s = ___ m/s^2

- Physics -
**Sioraf**, Sunday, April 11, 2010 at 2:25pm
So you just make the deacceleration the time?

- Physics -
**bobpursley**, Sunday, April 11, 2010 at 2:29pm
Huh? a= -25/.5=-50m/s^2

- Physics -
**Damon**, Sunday, April 11, 2010 at 2:30pm
(CHANGE IN VELOCITY} /TIME

as he said

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