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Magnitude of change in linear momentum

1. Homework Statement

A 0.70 kg ball is moving horizontally with speed of 9.6 m/s when it strikes a vertical wall. The ball rebounds with speed of 1.3 m/s. What is the magnitude of the change in linear momentum of the ball?


2. Homework Equations

Dp = mv(f) - mv(i)

3. The Attempt at a Solution

I solved for mv(f) and mv(i). Solved for Dp which I got -5.81 which is wrong.
 

Answers and Replies

Doc Al
Mentor
44,827
1,083
Hint: The initial and final velocities point in opposite directions.
 
-.91 - 6.72 = -7.63

Is the answer positive because magnitude is positive?
 
Doc Al
Mentor
44,827
1,083
That is correct.
 

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