A ball is moving with a speed v towards north, collides with an identical ball, moving with the same speed towards east. After the collision, the two balls stick together and move towards north-east. The speed of the combination is

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A ball is moving with a speed v towards north, collides with an identical ball, moving with the same speed towards east. After the collision, the two balls stick together and move towards north-east. The speed of the combination is

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