A Hockey Puck of Mass M Traveling Along the X

question 85

Multiple Choice

A hockey puck of mass m traveling along the x axis at 4.5 m/s hits another identical hockey puck at rest.If after the collision the second puck travels at a speed of 3.5 m/s at an angle of 30° above the x axis, what is the final velocity of the first puck?

• A)1.0 m/s, 30° below the x axis
• B)2.3 m/s, 50° below the x axis
• C)2.8 m/s, 60° below the x axis
• D)3.0 m/s, 45° below the x axis
• E)not enough information

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Something that has been achieved successfully.

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Acting in a way that is beneficial to oneself, often without regard for others.

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Concept with two widely used meanings: (1) an internal state that leads to effort expended toward objectives and (2) an activity performed by one person to get another to accomplish work.