   Chapter 2, Problem 21P

Chapter
Section
Textbook Problem

A 50.0-g Super Ball traveling at 25.0 m/s bounces off a brick will and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval?

To determine
The average acceleration of the Super Ball.

Explanation

Given info:

The initial velocity of the ball is -25.0m/s .

The final velocity of the ball is 22.0m/s .

The time interval at which the ball was in contact with the wall is 3.50ms .

Explanation:

Formula to calculate average acceleration is,

a¯=vfviΔt

• a¯ is the average acceleration of the Super Ball
• vf is the final velocity of the ball
• vi is the initial velocity of the ball
• Δt is the time interval

Substitute 22m/s for vf , 25.0m/s for vi and 3.50ms for Δt to find a¯

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