Maths-
If 
then descending order of 
is
Maths-General
Answer:The correct answer is:
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,
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physics-General
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physics-General
The acceleration of centre of mass is
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physics-General
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and 
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Since, all collisions are elastic, so velocity of sphere 1 is transferred to sphere 2, then from 2 to 3 and finally from 3 to 4. Hence, just after collision, the sphere 4 attains a velocity equal to
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or
or
or
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or
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or
or
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or
or