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# A 0.500-kg block, attached to a spring with length 0.60 m ISBN: 9780321675460 31

## Solution for problem 75P Chapter 7

University Physics | 13th Edition

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Problem 75P

A 0.500-kg block, attached to a spring with length 0.60 m and force constant 40.0 N/m, is at rest with the back of the block at point A on a frictionless, horizontal air table (Fig. P7.69). The mass of the spring is negligible. You move the block to the right along the surface by pulling with a constant 20.0-N horizontal force. (a) What is the block’s speed when the back of the block reaches point B, which is 0.25 m to the right of point A? (b) When the back of the block reaches point B, you let go of the block. In the subsequent motion, how close does the block get to the wall where the left end of the spring is attached?

Step-by-Step Solution:

Solution 75P Step 1: Work done to move the block, W = FS Where, F - Force applied on the block S - Displacement for the block. Provided, horizontal force, F = 20 N Displacement for the block, S = 0.25 m W = 20 N × 0.25 m = 5 J

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321675460

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A 0.500-kg block, attached to a spring with length 0.60 m