The author and his grandmother might have used their mother-tongue to converse with each other. As the author, Khushwant Singh, belonged to Punjab, the language used by them might be Punjabi.
Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following (Fig. 5.14) is a possible result after collision ?
