Sunday, February 05, 2006

Example: A Baseball Pitch

What is the acceleration of a fastball?

A baseball pitcher throws a fast ball. The ball goes from rest to a speed of 50m/s in his hand. His throwing action covers a distance of two meters. Find the acceleration of the ball, assuming it is constant.

We have a=(v2-v02)/2(x-x0) = 625m/s2 ~ 70 gravities!

We can make a dimensional analysis of the terms in (5) to check that they are consistent:

[a0x]=(L/T2)*L OK

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