Question
Asked Mar 13, 2020
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A billiard ball rolling across a table at 1.50 m/s makes a head-on elastic collision with an identical ball. Find the speed of each ball after the collision (a) when the second ball is initially at rest, (b) when the second ball is moving toward the first at a speed of 1.00 m/s, and (c) when the second ball is moving away from the first at a speed of 1.00 m/s.

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Expert Answer

Step 1

Let m be the mass of the billiard ball,

Physics homework question answer, step 1, image 1

Using conservation of energy and momentum we will find the unknowns,

Physics homework question answer, step 1, image 2

 

Step 2

a) It is given that second ball is initially at rest,

Physics homework question answer, step 2, image 1

Step 3

b) The second ball is moving towards first ball with speed of 1 m/s.

Physics homework question answer, step 3, image 1

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