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Question

Two ice skaters A and B approach each other at right angles. Skater A has a mass 30kg and velocity 1m/s skater B has a mass 20kg and velocity 2m/s. They meet and cling together. Their final velocity of the couple is:

A
2m/s
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B
1.5m/s
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C
1m/s
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D
2.5m/s
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Solution

The correct option is C 1m/s
m1v1+(m2v2)=(m1+m2)v
(30×2)2+(20×2)2=(50)V
50=50×v
v=1m/s

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