Posted by **noah** on Thursday, June 23, 2011 at 1:33am.

a baseball pitcher throws a baseball with a speed of 4m/s.Estimate the average acceleration of the ball during the throwing motion.In throwing the baseball,the pitcher accelerates the ball through a displacement of about 3.5m,from behind the body to the point where it is released.

- physics -
**drwls**, Thursday, June 23, 2011 at 2:40am
4 m/s is a very slow pitch. It is only 8.95 mph. A ball thrown at that speed would not make it to the batter's box without rolling there.

Are you sure you copied the problem correctly? A good pitcher throws fast balls over 90 mph.

Average speed while throwing = 2 m/s.

Time = Distance/(Avg speed) = 3.5m/(2 m/s)

= 1.75 s.

Final speed divided by that time is the acceleration.

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**noah**, Thursday, June 23, 2011 at 5:30am
ya

its 41 speed

nvm

thx ya^^

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**drwls**, Thursday, June 23, 2011 at 6:13am
Repeat the calculations indicated but starting with V = 41 m/s, not 4 m/s.

The average speed during the throw is

20.5 m/s. The time spent throwing is

T = 3.5/20.5 = 0.1707 s

The acceleration of the ball during the throw is (41 m/s)/(0.1707s)= 240 m/s^2

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**Pat**, Tuesday, October 11, 2011 at 9:34pm
How do you find the average speed?

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**rose**, Sunday, January 29, 2012 at 3:54pm
its your first speed divided by 2

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**Georeg**, Friday, September 7, 2012 at 3:25pm
Why divide it by two??

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