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  • Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m s -1 collide and rebound with the same speed. What is the impulse imparted to each ball due to the other ?

Q5.18 Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6ms^{-1} collide and rebound with the same speed. What is the impulse imparted to each ball due to the other?

Answers (1)

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Impulse imparted can be calculated by knowing the change in momentum.

The initial momentum of each ball is :

                                                        p_i\ =\ mu\ =\ (0.05) 6\ =\ 0.3\ Kg\ m/s

The final momentum is given by : 

                                                         p_f\ =\ mv\ =\ (0.05) (-6)\ =\ -\ 0.3\ Kg\ m/s

So the impulse is :

                                                I\ =\ p_f\ -\ p_i

or                                                   =\ -0.3\ -\ 0.3

or                                                   =\ -0.6\ Kg\ m/s

Posted by

Devendra Khairwa

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