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and center of mass velocity v. It collides elastically and head on with an identical sphere B at rest. Neglect friction everywhere. After the collision, their angular speeds are

, respectively, then

Chemistry

The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by
(a) 14.6, 13.6
(b) 13.6, 14.6
(c) 13.6, 13.6
(d) 14.6, 14.6

Mathematics

The number of permutations of the set {1, 2, 3, 4} in which no two adjacent positions are filled by consecutive integers (increasing order)

(a) is a prime
(b) is a composite number divisible by 3
(c) does not exceed 17
(d) is at most 19

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