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Two identical balls marked 2 and 3, in contact with each other and at rest on a horizontal frictionless table, are hit head-on by another identical ball marked 1 moving initially with a speed v as shown in below figure. What is observed, if the collision is elastic?

Ball 1 comes to rest and ball 2 and 3 roll out with speed v/2 each.
Balls 1 and 2 come to rest and ball 3 rolls out with speed v.
Balls 1, 2 and 3 roll out with speed v/3 each.
Balls 1, 2, and 3 come to rest.

Chemistry

The expression of average speed of molecule of a gas is given as

Mathematics

Let [x] = greatest integer . Two rational numbers x and y which satisfy x + y = 2 and then x - y is equal to

(a) 0 (b) 1 (c) 2 (d) -1

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