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Question

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

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

The correct option is C 1 m/s
Mass of combined body = 50 kg

By conserving momentum, 30i+40j=50v
|v|=50 kg - m5 kg=1m/s

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