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Q.

Two solid rubber balls A and B having masses 200 & 400 gm respectively are moving in opposite direction with velocity of A equal to 0.3 m/sec. After collision the two balls come to rest then the velocity of B is

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a

None of the above

b

1.5 m/sec

c

0.15 m/sec

d

−0.15m/sec

answer is A.

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Detailed Solution

m1=0.2kg, m2=0.4kg, v1=0.3m/s, v2=? 

Applying law of conservation of momentum

⇒m1v1=m2v2 v2=0.2×0.30.4=0.15m/s

 

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