What Is the Average Acceleration of a Baseball Hit by a Bat?

AI Thread Summary
The discussion centers on calculating the average acceleration of a baseball hit by a bat, specifically a scenario involving a player hitting a curveball. The initial velocity of the ball is 96 mi/hr, and after contact, it moves at -56 mi/hr, with the contact duration being 0.75 milliseconds. The average acceleration is calculated using the formula a = (Vf - Vi) / t, resulting in a value of -2.03 x 10^-3 mi/hr/s. However, there is a discrepancy with another source stating the acceleration as 2.0 x 10^5 mi/hr/s, indicating a potential error in the calculations. The discussion highlights the importance of careful unit conversion and accurate computation in physics problems.
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Homework Statement

Need assistance with this problem.

Homer Agin leads the Varsity team in home runs. In a recent game, Homer hit a 96 mi/hr sinking curve ball head on, sending it off his bat in the exact opposite direction at 56 mi/hr. The actually contact between ball and bat lasted for 0.75 milliseconds. Determine the magnitude of the average acceleration of the ball during the contact with the bat. Express your answer in both mi/hr/s and in m/s/s. (Given: 1.00 m/s = 2.24 mi/hr)

Vf=-56mi/hr Vi=96mi/hr
t=7.5×10^4s

Homework Equations


a=v÷t

The Attempt at a Solution


(-56-96)÷7.5×10^4=-2.03×10^-3mi/hr/s

The answer to the problem on the link http://www.physicsclassroom.com/calcpad/1dkin/prob8.cfm says 2.0 x 10^5 mi/hr/s for one of the answers.
 
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I think you simply plugged it in wrong, (-56-96)÷7.5×10^4 = 2.0 x 10^5
 

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