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Two billiard balls of equal mass move at right angles and meet at the origin of...

Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upward along the y axis at vA = 1.9m/s , and ball B is moving to the right along the x axis with speed vB = 5.4m/s . After the collision, assumed elastic, ball B is moving along the positive y axis(Figure 1) . What is the final direction of ball A? What are their two speeds?

Solutions

Expert Solution

conservation of momentum along x axis direction

m*5.4=m*va

va=5.4m/s

conservation of momentum along y axis direction

m*1.9=m*vb

vb=1.9m/s

So, we can get Vbar1y= 5.4ibar kg m/s, Vbar2y= 1.9jbar m/s.

genius_generous answered 2 years ago
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