Q.
An object of mass m1 collides with another object of mass m2, which is at rest. After the collision the objects move with equal speeds in opposite direction. The ratio of the masses m2:m1 is
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a
1 : 2
b
3 : 1
c
1 : 1
d
2 : 1
answer is B.
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Detailed Solution
Before collision, u1=u;u2=0, After collision v1=−v;v2=v If the collision is elastic, then we can write u1−u2=v2−v1 ⇒u=2v -----(1)Applying principle of conservation of momentum m1u=m2−m1v -----2From (1) & (2) we get m2m1=3
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