Doubt in jee09 solution

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I GOT ANSWER AS 3

PLS POINT OUT THE MISTAKE IN MY SOLUTION:

m_A(9)=m_Bv_B (Since collision is elastic)

Thus, v_B=9/2 ms^-1

Collision between B and C is inelastic

so 2mv_B=3mv_common

So v_common=3 ms^-1

But ans given is 4 ms^-1

#Physics #Mechanics

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2 Answers

106

Asish Mahapatra ·2009-04-22 23:07:52

1 st collision:
9m = mv1 + 2mv2
u have assumed mv1=0 that is wrong
v2-v1=9

2nd collision:
find v2 from above
so, 2mv2 = 3mv
==> v = 2v₂/3

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rahul wadhwani ·2009-04-22 23:08:08

this mistake i also do but there is slight mistake in the first line that u have stopped body -a after collision which is possible when both have same mass

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Doubt in jee09 solution

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