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Q.

A body of mass 6kg travelling with a velocity 10 m/s collides head - on and elastically with a body of mass 4kg travelling at a speed 5 m/s in opposite direction. The velocity of the second body after the collision is

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a

0 m/s.

b

6 m/s

c

8 m/s

d

13 ms–1

answer is D.

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Detailed Solution

Conserving Linear momentum−6V1+4V2=6×10−4×5⇒3V1+2V2=20…Also, V2-V110+5=e=1⇒V2−V1=15Solving ,V1 =-2m/s and V2 =15+(-2)=13m/s
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A body of mass 6kg travelling with a velocity 10 m/s collides head - on and elastically with a body of mass 4kg travelling at a speed 5 m/s in opposite direction. The velocity of the second body after the collision is