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A ball of mass 100g and another ball of 120g moves towards each other with  speeds 6...

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madmoni06 | Student | (Level 1) Honors

Posted April 11, 2013 at 8:22 AM via web

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A ball of mass 100g and another ball of 120g moves towards each other with  speeds 6 m/s and 5 m/s respectively . If they stick to each other after colliding, what would be the velocity of the combined mass after the collision?

a.15 m/s

b.-10 m/s

c.10 m/s

d.none of these

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pramodpandey | College Teacher | (Level 3) Valedictorian

Posted April 11, 2013 at 8:34 AM (Answer #1)

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d.none of these

By law of conservation of momentum. after collision and before collision  ,momentum will remain same.

`m_1=.1 kg ,m_2=.120 kg`

`v_1=6ms^(-1) ,v_2=5ms^(-1)`

`` combined mass v=.1+.120=.220kg

let combined velocity= v

.220v=.1x6+.120x(-5)

       =0

v=0 m/s

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