# A baseball (m = 137 g) approaches a bat horizontally at a speed of 39.9 m/s (89 mi/h) and is hit...

## Question:

A baseball (m = 137 g) approaches a bat horizontally at a speed of {eq}39.9\ m/s\ (89\ mi/h){/eq} and is hit straight back at a speed of {eq}45.9\ m/s{/eq} (103 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by the bat? Neglect the weight of the ball, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.

## Speed of a System:

Suppose that the total distance which is covered by an object or a system, and the total time taken by that system or object to cover the total distance is given, then the speed of the object can be obtained by using the following written relation.

{eq}\text{Speed}\ \text{of}\ \text{the}\ \text{Object}=\dfrac{\text{Total}\ \text{Covered}\ \text{Distance}}{\text{Total}\ \text{time}\ \text{taken}} {/eq}

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Given- The mass of the baseball is {eq}m=137\ \text{g}=137\times {{10}^{-3}}\ \text{kg} {/eq}, the initial speed of the baseball is... System Bus in Computers: Definition & Concept

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Chapter 3 / Lesson 12
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A system bus in a computer is the way information travels from the central processing unit to computer memory to devices. Explore the definition and function of this system.